✨ Rewrite RLIKE operations to LIKE and INSTR where possible

[joocer]

Regex Pattern	Optimized Form
^abc$	col = 'abc'
^abc	col LIKE 'abc%'
abc$	col LIKE '%abc'
.*abc.*	col LIKE '%abc%'
abc (no .*)	col INSTR 'abc'
a.c	col LIKE 'a_c'