RFC 2292 struct and constant definitions #4628

Job	Run time
Check ctest MSRV	17s
Style check	29s
Clippy on ubuntu-24.04	17s
Verify build (beta, (aarch64\|x86_64))	2m 0s
Verify build (nightly, 1)	12m 1s
Clippy on macos-15	16s
Test tier1 (aarch64-unknown-linux-gnu, ubuntu-24.04-arm)	50s
Verify build (nightly, 2)	11m 40s
Verify build (stable)	6m 58s
Test tier1 (i686-unknown-linux-gnu)	51s
Verify build (1.63.0)	7m 30s
Clippy on windows-2025	1m 34s
Test tier1 (aarch64-pc-windows-msvc, windows-11-arm)	59s
Ensure docs build	22s
Test tier1 (aarch64-apple-darwin, macos-15)	36s
Test tier1 (x86_64-unknown-linux-gnu)	53s
Test tier1 (x86_64-pc-windows-gnu, windows-2025, 64, x86_64)	56s
Test tier1 (x86_64-pc-windows-msvc, windows-2025)	52s
Test tier1 (i686-pc-windows-msvc, windows-2025)	50s
Test tier2	-1s
Test tier2 VM	-1s
success	3s
	50m 12s

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