fs: add `Temporal.Instant` support to `Stats` and `BigIntStats` #6891

Job	Run time
Build slim tarball	1m 18s
aarch64-linux: Cache V8 build	23s
x86_64-darwin: with shared libraries	5m 23s
x86_64-linux: with shared libraries	28m 30s
aarch64-darwin: with shared libraries	29m 23s
aarch64-linux: with shared openssl-4.0.0	24m 56s
aarch64-linux: with shared boringssl-0.20260413.0	24m 20s
aarch64-linux: with shared openssl-3.0.19	24m 18s
aarch64-linux: with shared openssl-3.5.5	23m 37s
aarch64-linux: with shared openssl-3.6.1	24m 57s
aarch64-linux: with shared openssl-1.1.1w	23m 29s
x86_64-darwin: with shared libraries	37m 50s
Build slim tarball	1m 18s
aarch64-linux: Cache V8 build	23s
aarch64-linux: with shared boringssl-0.20260413.0	24m 20s
aarch64-linux: with shared openssl-1.1.1w	23m 29s
aarch64-darwin: with shared libraries	29m 23s
x86_64-linux: with shared libraries	28m 30s
aarch64-linux: with shared openssl-3.5.5	23m 37s
aarch64-linux: with shared openssl-3.0.19	24m 18s
aarch64-linux: with shared openssl-3.6.1	24m 57s
aarch64-linux: with shared openssl-4.0.0	24m 56s
	7h 33m 35s

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