Add a version of BalanceDuration which take two TimeDurationRecord
and add them internally after converting to BigInt as nanoseconds so it will not overflow the double.

Use "std::isinf()" instead of "!std::isfinite()"

Inspired by https://github.com/tc39/proposal-temporal/issues/2380#issuecomment-1219194995

Bug: v8:11544
Change-Id: I29e06fa857ff43f2668e1e4ffd07735ff6efee42
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3837852
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82576}