feat: Add arrayApproxEqualString to handle null characters in string.

[singh1203]

Fixes: #56

Rationale for this change

Many databases, including PostgreSQL, do not accept null characters (\x00) in strings. This PR introduces arrayApproxEqualString & arrayApproxEqualLargeString, functions that enables approximate equality comparison for string arrays while ignoring trailing null characters. This helps improve consistency with database behavior and aligns with existing arrayApproxEqualFloat16.

What changes are included in this PR?

• Added arrayApproxEqualString:
  • Compares two string arrays for approximate equality.
  • Ignores trailing null characters (\x00).
• Added unit tests in compare_test.go to verify correctness.

Are these changes tested?

Yes, unit tests have been added to validate:

• Identical strings return true.
• Strings differing only in trailing null characters return true.
• Completely different strings return false.

Are there any user-facing changes?

No

[zeroshade]

should also add the same for StringView too please

[singh1203]

should also add the same for StringView too please

Added!

[singh1203]

@zeroshade I think we are GTG here.
Thank you.