fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6739

Job	Run time
Build slim tarball	1m 8s
aarch64-linux: Cache V8 build	24s
aarch64-darwin: with shared libraries	25m 13s
x86_64-darwin: with shared libraries	35m 0s
x86_64-linux: with shared libraries	23m 58s
aarch64-linux: with shared openssl-4.0.0	21m 8s
aarch64-linux: with shared openssl-3.5.5	21m 8s
aarch64-linux: with shared openssl-3.0.19	21m 47s
aarch64-linux: with shared boringssl-0.20260413.0	21m 34s
aarch64-linux: with shared openssl-1.1.1w	20m 51s
aarch64-linux: with shared openssl-3.6.1	21m 9s
	3h 33m 20s

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