fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6699

Job	Run time
${{ matrix.system }}: with shared libraries	0s
aarch64-linux: with shared ${{ matrix.openssl.name }}	0s
aarch64-linux: Cache V8 build	-7s
github.event_name == 'workflow_dispatch' && 'Skipped job' \|\| 'Build slim tarball'	-10s
	-17s

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