fix: use different default schema per dialect, escape quotes in identifiers instead of removing them, normalize Model.getTableName

[ephys]

Description Of Change

This PR is yet-another preliminary PR for #14687 in order to prevent that other PR from growing endlessly.

The goal of this PR is to:

• Introduce AbstractQueryGeneratorTypeScript and migrate some base QueryGenerator methods to TypeScript
• Normalize which schema is used by introducing getDefaultSchema, and rewriting extractTableDetails. We should eventually arrive at a state where all query generator methods default the table schema to either the schema set through Sequelize's options, or the per-dialect default schema.
• change quoteIdentifier with one very important change:
  queryGenerator.quoteIdentifier('"abc"') previously unquoted then quoted its input. Quotes are actually valid as identifiers, as long as they're escaped. Instead of returning "abc", this method will now return """abc""" (triple " because one is the actual identifier delimiter, and two consecutive "" is how we escape ").
• deprecate addTicks, removeTicks, and TICK_CHAR, wrapSingleQuote for the above reason

Because quoteIdentifier doesn't remove existing quotes anymore, I had to tweak parts of queryGenerator. Functions like selectQuery passed its identifiers to quoteIdentifier multiple times. Causing duplicate quotes.

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My current plan for AbstractQueryGeneratorTypeScript is to only move APIs once they are considered stable & suitable for public use.

[WikiRik]

Thanks for this PR!

[WikiRik]

SQLite unit tests fail since I included a test for the schema, but we've said that sqlite does not support schemas so we'll need to see how to deal with that