fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6846

Job	Run time
Build slim tarball	1m 16s
aarch64-linux: Cache V8 build	20s
x86_64-darwin: with shared libraries	44m 19s
aarch64-darwin: with shared libraries	26m 47s
x86_64-linux: with shared libraries	26m 44s
aarch64-linux: with shared openssl-3.0.19	23m 36s
aarch64-linux: with shared boringssl-0.20260413.0	22m 21s
aarch64-linux: with shared openssl-3.6.1	23m 55s
aarch64-linux: with shared openssl-1.1.1w	23m 38s
aarch64-linux: with shared openssl-3.5.5	23m 2s
aarch64-linux: with shared openssl-4.0.0	22m 46s
	3h 58m 44s

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