WIP projection API #1682

Job	Run time
lint	2m 45s
create-windows-binary-distribution (3.7)	4m 37s
create-windows-binary-distribution (3.8)	4m 36s
create-windows-binary-distribution (3.9)	4m 41s
create-windows-binary-distribution (3.10)	4m 33s
create-windows-binary-distribution (3.11)	4m 38s
create-source-distribution	1m 52s
test-linux-source-distribution (ubuntu:18.04)	1m 18s
test-linux-source-distribution (ubuntu:20.04)	1m 35s
test-linux-source-distribution (ubuntu:22.04)	1m 39s
test-linux-source-distribution (ubuntu:22.10)	1m 37s
test-linux-source-distribution (ubuntu:23.04)	1m 35s
test-linux-source-distribution (fedora:35)	1m 35s
test-linux-source-distribution (fedora:36)	1m 39s
test-linux-source-distribution (fedora:37)	1m 36s
test-windows-binary-distribution	0s
deploy	0s
	40m 16s

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