fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6837

Job	Run time
Build slim tarball	1m 9s
aarch64-darwin: with shared libraries	24m 15s
aarch64-linux: Cache V8 build	26s
x86_64-linux: with shared libraries	28m 17s
x86_64-darwin: with shared libraries	36m 1s
aarch64-linux: with shared openssl-4.0.0	24m 0s
aarch64-linux: with shared openssl-1.1.1w	22m 45s
aarch64-linux: with shared openssl-3.0.19	23m 42s
aarch64-linux: with shared openssl-3.5.5	24m 11s
aarch64-linux: with shared openssl-3.6.1	23m 27s
aarch64-linux: with shared boringssl-0.20260413.0	23m 58s
	3h 52m 11s

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