fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6728

Job	Run time
Build slim tarball	1m 0s
aarch64-darwin: with shared libraries	6m 21s
x86_64-darwin: with shared libraries	6m 34s
x86_64-linux: with shared libraries	6m 17s
aarch64-linux: Cache V8 build	20s
aarch64-linux: with shared openssl-3.6.1	5m 54s
aarch64-linux: with shared openssl-3.5.5	5m 58s
aarch64-linux: with shared openssl-1.1.1w	5m 54s
aarch64-linux: with shared openssl-3.0.19	5m 54s
aarch64-linux: with shared boringssl-0.20260413.0	5m 52s
aarch64-linux: with shared openssl-4.0.0	5m 54s
	55m 58s

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