fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6920

Job	Run time
Build slim tarball	1m 25s
aarch64-linux: Cache V8 build	21s
x86_64-darwin: with shared libraries	44m 3s
x86_64-linux: with shared libraries	27m 7s
aarch64-darwin: with shared libraries	27m 54s
aarch64-linux: with shared openssl-3.6.1	23m 49s
aarch64-linux: with shared openssl-4.0.0	23m 42s
aarch64-linux: with shared openssl-1.1.1w	23m 27s
aarch64-linux: with shared openssl-3.0.19	22m 58s
aarch64-linux: with shared openssl-3.5.5	23m 35s
aarch64-linux: with shared boringssl-0.20260413.0	23m 29s
	4h 1m 50s

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