fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6734

Job	Run time
Build slim tarball	1m 13s
aarch64-linux: Cache V8 build	20s
x86_64-linux: with shared libraries	24m 11s
x86_64-darwin: with shared libraries	38m 56s
aarch64-darwin: with shared libraries	23m 56s
aarch64-linux: with shared boringssl-0.20260413.0	21m 31s
aarch64-linux: with shared openssl-3.0.19	21m 29s
aarch64-linux: with shared openssl-3.6.1	21m 17s
aarch64-linux: with shared openssl-1.1.1w	20m 34s
aarch64-linux: with shared openssl-4.0.0	21m 18s
aarch64-linux: with shared openssl-3.5.5	21m 34s
	3h 36m 19s

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