fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6705

Job	Run time
Build slim tarball	1m 31s
aarch64-darwin: with shared libraries	25m 3s
x86_64-darwin: with shared libraries	40m 31s
aarch64-linux: Cache V8 build	24s
x86_64-linux: with shared libraries	30m 7s
aarch64-linux: with shared openssl-4.0.0	24m 55s
aarch64-linux: with shared openssl-3.6.1	24m 47s
aarch64-linux: with shared openssl-3.0.19	25m 3s
aarch64-linux: with shared openssl-1.1.1w	24m 39s
aarch64-linux: with shared openssl-3.5.5	25m 11s
aarch64-linux: with shared boringssl-0.20260413.0	25m 58s
	4h 8m 9s

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