fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6700

Job	Run time
Build slim tarball	1m 10s
${{ matrix.system }}: with shared libraries	1s
aarch64-linux: Cache V8 build	1s
aarch64-linux: with shared ${{ matrix.openssl.name }}	1s
	1m 13s

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