Toucan-connectors

Changed

- All connectors: Add support for an optional `db_name` parameter in the `get_model` method.
- MySQL: Use the provided `db_name` for discoverability when possible in `get_model`.
- MySQL: Simplify query for schema construction in order to be compatible with older versions
- Redshift: Add an option to disable TCP keep-alive (enabled by default).

Changed

- MySQL: Do not specify a database on discoverability-related functions (listing databases and describing table schemas).

Changed

- Conditions: The unquoting logic is now only applied when the passed parameter is a string

Changed

- Athena: Parameters are now passed as SQL parameters rather than interpolated by us in order to prevent SQL injection.
- Conditions: Strings are now unquoted for conditions applying only to numbers (`lt`, `lte`, `gt`, `gte`).

Changed

- MySQL: Return a more explicit error message in case no query is specified

Changed

- Mysql: Revert the `following_relations` attribute as deprecated
- Athena: Add an option allowing to toggle CTAS (disabled by default)