improve sqlite reflection regex for unusual names/formats

improve sqlite reflection regex for unusual names/formats

A series of improvements have been made for reflection of CHECK constraints
on SQLite. The reflection logic now correctly handles table names
containing the strings "CHECK" or "CONSTRAINT", properly supports all four
SQLite identifier quoting styles (double quotes, single quotes, brackets,
and backticks) for constraint names, and accurately parses CHECK constraint
expressions containing parentheses within string literals using balanced
parenthesis matching with string context tracking.    Big thanks to
GruzdevAV for new test cases and implementation ideas.

Fixes: #12924
Change-Id: I0390ac334c98e934c7e0353f47c9f43204791af5