fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6730

Job	Run time
Build slim tarball	1m 20s
aarch64-linux: Cache V8 build	26s
x86_64-darwin: with shared libraries	44m 48s
aarch64-darwin: with shared libraries	23m 10s
x86_64-linux: with shared libraries	24m 10s
aarch64-linux: with shared boringssl-0.20260413.0	21m 59s
aarch64-linux: with shared openssl-3.5.5	22m 0s
aarch64-linux: with shared openssl-4.0.0	21m 50s
aarch64-linux: with shared openssl-3.0.19	21m 44s
aarch64-linux: with shared openssl-1.1.1w	20m 53s
aarch64-linux: with shared openssl-3.6.1	21m 50s
	3h 44m 10s

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