fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6887

Job	Run time
Build slim tarball	1m 11s
aarch64-linux: Cache V8 build	25s
x86_64-linux: with shared libraries	1m 57s
x86_64-darwin: with shared libraries	2m 2s
aarch64-darwin: with shared libraries	2m 0s
aarch64-linux: with shared boringssl-0.20260413.0	1m 58s
aarch64-linux: with shared openssl-3.5.5	1m 58s
aarch64-linux: with shared openssl-1.1.1w	1m 57s
aarch64-linux: with shared openssl-3.6.1	1m 57s
aarch64-linux: with shared openssl-4.0.0	1m 58s
aarch64-linux: with shared openssl-3.0.19	1m 58s
	19m 21s

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