fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6703

Job	Run time
Build slim tarball	1m 1s
aarch64-linux: Cache V8 build	24s
x86_64-darwin: with shared libraries	7m 56s
aarch64-darwin: with shared libraries	7m 56s
x86_64-linux: with shared libraries	7m 47s
aarch64-linux: with shared boringssl-0.20260413.0	7m 49s
aarch64-linux: with shared openssl-4.0.0	7m 47s
aarch64-linux: with shared openssl-3.0.19	7m 46s
aarch64-linux: with shared openssl-1.1.1w	7m 22s
aarch64-linux: with shared openssl-3.5.5	7m 49s
aarch64-linux: with shared openssl-3.6.1	7m 41s
	1h 11m 18s

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