Add full mode stdin parsing #578

Job	Run time
install (ocaml-base-compiler.4.10.1, ubuntu-latest)	7m 21s
install (ocaml-base-compiler.4.11.2, ubuntu-latest)	7m 15s
install (ocaml-base-compiler.4.12.1, ubuntu-latest)	7m 12s
install (ocaml-base-compiler.4.13.1, ubuntu-latest)	7m 11s
install (ocaml-base-compiler.4.14.0, ubuntu-latest)	7m 8s
install (ocaml-variants.4.14.0+options,ocaml-option-flambda, ubuntu-latest)	3m 15s
install (ocaml-base-compiler.5.0.0, ubuntu-latest)	7m 1s
install (ocaml-base-compiler.4.10.1, macos-latest)	1s
install (ocaml-base-compiler.4.11.2, macos-latest)	1s
install (ocaml-base-compiler.4.12.1, macos-latest)	1s
install (ocaml-base-compiler.4.13.1, macos-latest)	1s
install (ocaml-base-compiler.4.14.0, macos-latest)	1s
install (ocaml-variants.4.14.0+options,ocaml-option-flambda, macos-latest)	1s
install (ocaml-base-compiler.5.0.0, macos-latest)	1s
install (ocaml-variants.4.10.1+mingw64c, windows-latest)	6m 40s
install (ocaml-variants.4.11.2+mingw64c, windows-latest)	6m 0s
install (ocaml-variants.4.12.1+mingw64c, windows-latest)	5m 33s
install (ocaml-variants.4.13.1+mingw64c, windows-latest)	3m 27s
install (ocaml-variants.4.14.0+mingw64c, windows-latest)	3m 12s
install (ocaml-variants.4.14.0+flambda+mingw64c, windows-latest)	3m 58s
	1h 15m 20s

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