Fix REPLACE function to handle numbers like MySQL/SQLite

[Copilot]

Thank you for the time you are putting into AlaSQL!

The REPLACE function was throwing an error when passed numeric values instead of converting them to strings like MySQL/SQLite do.

Changes:

• Modified stdfn.REPLACE in src/55functions.js to call .toString() on all three parameters (target, pattern, replacement)
• Rewrote test/test1455.js with proper test coverage for numeric handling

Example:

-- Both now return '1_3' (matching MySQL/SQLite behavior)
SELECT REPLACE('123', '2', '_')
SELECT REPLACE(123, '2', '_')

-- Numbers work in pattern and replacement too
SELECT REPLACE(123, 2, 9)  -- returns '193'

#1455

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