Fix Lexer string regex to support ansi-sql quoting

[griffio]

fixes sqldelight/sqldelight#3747

• Add regex pattern that supports quote-escaping used by Ansi-Sql
• Add fixture test can be run by all dialects

The current regex doesn't support this.

e.g INSERT INTO foo VALUES ('It''s a string');

Fixes the SqlLexer as this is the actual tokenizer used by the parser at build time.

sql.bnf is updated for consistency as is used by GrammarKit tooling.

Tested integration with SqlDelight

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• CHANGELOG.md's "Unreleased" section has been updated, if applicable.

[griffio]

@dellisd
If you are planning another SqlDelight release we could update the sqlpsi dependency.
Including this (needs 🧜‍♂️) , I know I have fixed some other bits and pieces since last time.
https://github.com/sqldelight/sql-psi/blob/master/CHANGELOG.md

[JakeWharton]

I can do a release and Renovate will do the rest. I forgot you can't merge your own PRs in here.