fix(Databricks): Escape catalog and schema names in pre-queries

[Vitor-Avila]

SUMMARY

It's possible to create catalogs and schemas in Databricks with special characters, which requires to always "escape" them in queries. For example, if you use a hyphen in a catalog name, you must run:

USE CATALOG `my-catalog`;

This PR escapes the catalog and schema names in the get_prequeries method for the Databricks Native Connector (if they were not escaped in the connect_args JSON).

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

No UI changes.

TESTING INSTRUCTIONS

Unit tests added. For manual testing:

1. Create a catalog and a schema containing hyphens in Databricks.
2. Connect Superset to the instance using the Databricks Native connector.
3. Run a query in SQL Lab.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[Vitor-Avila]

I didn't use database.quote_identifier(), because the Database is no longer passed as an argument in >=4.1.0: https://github.com/apache/superset/blob/4.1.0/superset/db_engine_specs/base.py#L1412-L1431

Since this method is specifically for Databricks, I thought it was OK to hardcode the quote identifiers.

[betodealmeida]