Add preliminary support for bodyless reactions

[erlingrj]

Adds support for bodyless reactions which I think fits very nicely with our BYOBS (bring your own build system) line of thinking :)

[github-actions]

Memory usage after merging this PR will be:

Memory Report

action_empty_test_c

	from	to	increase (%)
text	59655	59655	0.00
data	744	744	0.00
bss	10112	10112	0.00
total	70511	70511	0.00

action_microstep_test_c

	from	to	increase (%)
text	60486	60486	0.00
data	752	752	0.00
bss	10112	10112	0.00
total	71350	71350	0.00

action_overwrite_test_c

	from	to	increase (%)
text	60323	60323	0.00
data	744	744	0.00
bss	10112	10112	0.00
total	71179	71179	0.00

action_test_c

	from	to	increase (%)
text	60259	60259	0.00
data	752	752	0.00
bss	10112	10112	0.00
total	71123	71123	0.00

deadline_test_c

	from	to	increase (%)
text	56102	56102	0.00
data	760	760	0.00
bss	10784	10784	0.00
total	67646	67646	0.00

delayed_conn_test_c

	from	to	increase (%)
text	61516	61516	0.00
data	744	744	0.00
bss	10112	10112	0.00
total	72372	72372	0.00

event_payload_pool_test_c

	from	to	increase (%)
text	18330	18330	0.00
data	624	624	0.00
bss	320	320	0.00
total	19274	19274	0.00

event_queue_test_c

	from	to	increase (%)
text	27597	27597	0.00
data	736	736	0.00
bss	480	480	0.00
total	28813	28813	0.00

nanopb_test_c

	from	to	increase (%)
text	42888	42888	0.00
data	904	904	0.00
bss	320	320	0.00
total	44112	44112	0.00

port_test_c

	from	to	increase (%)
text	61464	61464	0.00
data	744	744	0.00
bss	10112	10112	0.00
total	72320	72320	0.00

reaction_queue_test_c

	from	to	increase (%)
text	27319	27319	0.00
data	736	736	0.00
bss	480	480	0.00
total	28535	28535	0.00

request_shutdown_test_c

	from	to	increase (%)
text	60458	60458	0.00
data	744	744	0.00
bss	10112	10112	0.00
total	71314	71314	0.00

startup_test_c

	from	to	increase (%)
text	55801	55801	0.00
data	752	752	0.00
bss	10784	10784	0.00
total	67337	67337	0.00

tcp_channel_test_c

	from	to	increase (%)
text	91462	91462	0.00
data	1224	1224	0.00
bss	21344	21344	0.00
total	114030	114030	0.00

timer_test_c

	from	to	increase (%)
text	55692	55692	0.00
data	744	744	0.00
bss	10784	10784	0.00
total	67220	67220	0.00

[github-actions]

Benchmark results after merging this PR:

Benchmark results

Performance:

PingPongUc:
Best Time: 199.920 msec
Worst Time: 202.520 msec
Median Time: 200.631 msec

PingPongC:
Best Time: 173.276 msec
Worst Time: 181.830 msec
Median Time: 174.660 msec

ReactionLatencyUc:
Best latency: 37892 nsec
Median latency: 59609 nsec
Worst latency: 122853 nsec

ReactionLatencyC:
Best latency: 57429 nsec
Median latency: 59896 nsec
Worst latency: 105575 nsec

Memory usage:

PingPongUc:
text data bss dec hex filename
40748 752 8496 49996 c34c bin/PingPongUc

PingPongC:
text data bss dec hex filename
46044 872 360 47276 b8ac bin/PingPongC

ReactionLatencyUc:
text data bss dec hex filename
30273 736 2112 33121 8161 bin/ReactionLatencyUc

ReactionLatencyC:
text data bss dec hex filename
41666 840 360 42866 a772 bin/ReactionLatencyC

[github-actions]

Coverage after merging bodyless into main will be

70.76%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
action.c	81.90%	69.23%	100%	85.33%	120–121, 24, 43–46, 49, 51, 53, 56–58, 63–64, 73–74, 85–86
builtin_triggers.c	90.91%	70%	100%	96.77%	14, 18, 40, 43
connection.c	78.52%	51.16%	100%	88.66%	10, 104, 11, 110, 123–124, 136–137, 14, 14, 143, 145, 16–17, 21–22, 22, 22–23, 25, 27–28, 33, 48, 48, 48–49, 55, 60–62, 97
environment.c	78.35%	55.56%	84.62%	83.33%	12–13, 18, 20–21, 31, 35–36, 42–43, 51–52, 55–56, 60–61, 93–95
event.c	95.35%	92.86%	100%	96.15%	14–15
federated.c	5.41%	2.88%	7.69%	6.48%	100–102, 104, 104, 104–107, 109, 11, 111, 111, 111–112, 115, 118–119, 119, 119–120, 122–123, 125, 129, 13, 13, 13, 130, 132–134, 137, 139, 14, 140–144, 146–148, 15, 151–153, 153, 153–154, 154, 154–156, 158, 16, 161–162, 164–168, 17, 17, 17, 170–175, 177, 177, 177–180, 182, 182, 182–184, 184, 184–185, 189–190, 190, 190, 193–194, 198–199, 20, 200, 202, 202, 202, 204–208, 21, 211, 211, 211–214, 217–218, 218, 218–219, 22, 22, 22, 221–222, 225–226, 23, 231–232, 232, 232–233, 235, 237, 237, 237–239, 24, 24, 24, 240, 240, 240, 240, 240–249, 25, 250–252, 256, 259, 259, 259, 26, 260–261, 265, 268–269, 269, 269, 269, 27, 270–277, 279, 28, 28, 28, 285–287, 29, 299, 30, 30, 30, 30, 300, 303–306, 308, 308, 308–309, 31, 313–314, 314, 314, 316, 318–319, 319, 319, 32, 320, 320, 320–321, 321, 321–322, 322, 322–323, 323, 323–324, 324, 324, 326, 326, 326–327, 327, 327–328, 328, 328–329, 329, 329, 33, 331, 37, 37, 37, 37, 37–38, 40–43, 48, 48, 48, 48, 48–49, 52, 56–57, 59–62, 64, 64, 64–65, 65, 65, 67, 67, 67–69, 69, 69–71, 75–76, 80–81, 83–86, 88, 9, 90, 90, 90–91, 91, 91–92, 92, 92–93, 93, 93, 96–97, 99
logging.c	87.50%	80%	100%	88.64%	24, 37–39, 46, 59–60
port.c	81.43%	50%	100%	95.45%	10, 10, 10, 16, 20, 26, 26–28, 38, 38, 38–39
queues.c	89.94%	80.36%	100%	94.06%	108, 113, 119, 21–23, 47–48, 60–61, 84–88, 91–92
reaction.c	70.34%	54.55%	100%	78.26%	15, 17, 21–22, 28–31, 31, 31–32, 42, 45, 47, 52–53, 53, 53–55, 55, 55–56, 73, 89–91, 91, 91–94, 94, 94–95
reactor.c	69.33%	51.52%	100%	82.28%	10, 101–102, 14–19, 22, 28, 30, 32–37, 37, 37–38, 38, 38, 43, 55, 58–59, 59, 59–60, 60, 60–61, 63, 77–78, 81–82, 82, 82–83, 83, 83–84, 86, 91
serialization.c	50%	50%	50%	50%	16–17, 26–27, 33–35, 38–40
tag.c	40.19%	31.48%	60%	47.92%	14, 14–15, 17, 17–18, 23–24, 24, 24, 24, 24–25, 27, 27, 27, 27, 27–28, 30, 30, 30–31, 33–34, 34, 34–35, 37, 37, 37, 37, 37–38, 40, 40, 40, 40, 40–41, 43, 53–54, 63, 63–64, 83–85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85–87, 89
timer.c	95%	66.67%	100%	100%	14, 25
trigger.c	100%	100%	100%	100%
util.c	0%	0%	0%	0%	10, 3–4, 4, 4–5, 5, 5–6, 8–9
src/platform/posix
posix.c	52.73%	30%	66.67%	56%	100, 100, 100–102, 106, 16, 18, 20–21, 34–36, 38–40, 48–49, 54–59, 59, 59–62, 62, 62–64, 67, 73–74, 78, 81, 92–94, 94, 94–96, 98–99
tcp_ip_channel.c	70.44%	58.46%	100%	74.04%	101, 103, 107–108, 125–127, 132–135, 139–142, 161, 166, 166, 166, 170–171, 184–185, 188, 190, 190, 190, 192, 194, 197, 203–204, 206, 209, 224–225, 229–231, 233, 238–241, 244, 247, 250, 257–260, 263–266, 269–270, 301–303, 310, 315–317, 317, 317–318, 320–323, 332, 332–334, 356–359, 359, 359–361, 371–372, 372, 372–373, 373, 373–374, 378–379, 382, 394–395, 412–413, 417–418, 43, 433, 44, 463–464, 468–469, 473–474, 487–489, 52–53, 59–60, 60, 60–62, 66–68, 71–73, 87–88
src/schedulers/dynamic
scheduler.c	81.71%	63.83%	95%	87.71%	117, 119, 119, 126, 142, 203,