[FIX] Preserve quoted statement literals

[Mirochill]

Reference Issue

Fixes #178

What does this implement/fix? Explain your changes.

• Keeps main statement keyword formatting out of quoted string regions after the CREATE statement preformatting pass.
• Adds notebook regression coverage for formatting select * from rooms where command = 'on' without changing the string literal.

Any other comments?

Validation:

• git diff --check
• Parsed nbs/00_core.ipynb and nbs/99_additional_tests.ipynb as JSON
• Not run locally