feat(guardian-prover-health-check): add Startups, new routes for getting recent signed block

[cyberhorsey]

The guardian prover dashboard should display the latest version and revision the specific guardian prover is on, as well as a history of their restarts and what those revisions/versions were, and their timestamps. This PR introduces that functionality for the API and exposes those endpoints to consume, as well as a post route for the taiko-client to save their startups.

It also adds a Get most recent signed block endpoint for a specific guardian prover, and test coverage.

There is a corresponding taiko-client PR to send the startups here: taikoxyz/taiko-client#529

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Name	Status	Preview	Updated (UTC)
bridge-ui-v2-a6	✅ Ready (Inspect)	Visit Preview	Jan 24, 2024 11:38pm

[codecov]

Codecov Report

Attention: 89 lines in your changes are missing coverage. Please review.

Comparison is base (0e24d2d) 27.15% compared to head (0cc5f3f) 27.47%.

Files	Patch %	Lines
.../guardian-prover-health-check/http/post_startup.go	0.00%	38 Missing ⚠️
.../guardian-prover-health-check/repo/signed_block.go	0.00%	15 Missing ⚠️
...kages/guardian-prover-health-check/repo/startup.go	70.00%	11 Missing and 1 partial ⚠️
...h-check/http/get_startups_by_guardian_prover_id.go	35.71%	6 Missing and 3 partials ⚠️
...p/get_most_recent_startup_by_guardian_prover_id.go	57.14%	4 Missing and 2 partials ⚠️
...prover-health-check/healthchecker/healthchecker.go	0.00%	5 Missing ⚠️
..._most_recent_signed_block_by_guardian_prover_id.go	73.33%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           alpha-6   #15561      +/-   ##
===========================================
+ Coverage    27.15%   27.47%   +0.32%     
===========================================
  Files           94       99       +5     
  Lines         5700     5848     +148     
===========================================
+ Hits          1548     1607      +59     
- Misses        3988     4070      +82     
- Partials       164      171       +7     

Flag	Coverage Δ		*Carryforward flag
eventindexer	17.28% <ø> (ø)		Carriedforward from 0e24d2d
guardian-prover-health-check	35.94% <39.86%> (+1.09%)	⬆️
relayer	40.61% <ø> (ø)		Carriedforward from 0e24d2d

*This pull request uses carry forward flags. Click here to find out more.

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