chen - merge into 1 grammar in parser #110

Job	Run time
build-windows-macos (windows-latest, 24, -x doctest -PbuildPlatform=windows)	31m 22s
Get-CI-Image-Tag / Get-CI-Image-Tag	9s
build-windows-macos (macos-13, 24)	59m 57s
build-windows-macos (macos-13, 21)	53m 50s
build-windows-macos (windows-latest, 21, -x doctest -PbuildPlatform=windows)	31m 53s
build-linux (21)	42m 46s
bwc-tests (21)	8m 12s
bwc-tests (24)	8m 15s
build-linux (24)	43m 4s
	4h 39m 28s

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