fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6701

Job	Run time
Build slim tarball	12m 27s
x86_64-linux: with shared libraries	10m 14s
x86_64-darwin: with shared libraries	10m 36s
aarch64-linux: Cache V8 build	21s
aarch64-darwin: with shared libraries	10m 23s
aarch64-linux: with shared boringssl-0.20260413.0	9m 39s
aarch64-linux: with shared openssl-1.1.1w	10m 20s
aarch64-linux: with shared openssl-3.6.1	9m 40s
aarch64-linux: with shared openssl-3.0.19	9m 42s
aarch64-linux: with shared openssl-4.0.0	10m 19s
aarch64-linux: with shared openssl-3.5.5	10m 19s
	1h 44m 0s

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