Build `wasip3` target #1090

Job	Run time
Build only sysroot - exceptions	18m 19s
Build only sysroot - default	18m 48s
Build x86_64-linux	27m 16s
Build x86_64-macos	4m 27s
Build arm64-linux	16m 23s
Build x86_64-windows	3h 4m 27s
Build arm64-macos	24m 8s
Build arm64-windows	4h 55m 28s
Finalize wasi-sdk artifacts	9m 49s
Test standalone toolchain	3m 53s
	10h 2m 58s

Provide feedback