fs: add ignore option to fs.watch #2502

Job	Run time
Build slim tarball	1m 31s
x86_64-darwin: with shared libraries	58m 14s
x86_64-linux: with shared libraries	31m 9s
aarch64-darwin: with shared libraries	34m 12s
aarch64-linux: with shared libraries	26m 55s
	2h 32m 1s

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