Fix NaN handling in compare() function

[Bitshifter-9]

• Add explicit NaN checks in spaceship helper to ensure it always returns -1, 0, or 1
• Treat NaN as less than all other numbers and equal to itself for ordering
• Add comprehensive test coverage for NaN edge cases
• Fixes potential runtime errors from unexpected NaN return values

[acorncom]

As noted in #21017 (comment), we're working to move folks away from those utilities as they're from a different JS era. Appreciate you sending in the PR though!