fs: add ignore option to fs.watch #2494

Job	Run time
Build slim tarball	1m 28s
aarch64-darwin: with shared libraries	1h 14m 22s
x86_64-linux: with shared libraries	2h 5m 54s
aarch64-linux: with shared libraries	1h 27m 42s
x86_64-darwin: with shared libraries	1h 49m 10s
	6h 38m 36s

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