chore: minor fixes, logic improvements and optimization

[AyushCoder9]

Summary

This PR addresses several minor issues, improves validation logic, and optimizes keyword lookups to enhance codebase maintainability and robustness.

Changes

• src/utils/utils.js:
  • Improved isFunction regex to correctly handle strings with trailing spaces (e.g., "NOW() ").
  • Refactored isKeyword to use a Set for O(1) lookups instead of O(N).
• src/data/datatypes.js:
  • Fixed a logic flaw in the PostgreSQL TIMESTAMP check where a simple year string (e.g., "2024") could incorrectly pass as a valid timestamp due to an overlapping OR condition.
  • Improved consistency across database type checks.

Verification

• Verified isFunction with trailing spaces and mixed-case function names.
• Verified isKeyword with all supported SQL keywords.
• Confirmed PostgreSQL TIMESTAMP validation now correctly identifies full timestamp formats vs. partial date strings.
• Verified that existing functionality remains unaffected.

Checklist

• My code follows the project's style guidelines.
• I have performed a self-review of my own code.
• I have commented on my code, particularly in hard-to-understand areas.
• My changes generate no new lint warnings.

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