SQL Connector Bindings + SQL Execution API

[zacdav-db]

• [x] SQL execution API
  • [x] Documentation
  • [x] Tests
• [x] SQL connector bindings via reticulate
  • [x] Documentation
  • [x] Tests
• [x] Adjustments to handling of workspace URL in db_host() to force https and no longer require a scheme

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 52.38095% with 70 lines in your changes are missing coverage. Please review.

Project coverage is 83.77%. Comparing base (06b8821) to head (5630959). Report is 2 commits behind head on main.

Files	Patch %	Lines
R/sql-connector.R	2.94%	66 Missing :warning:
R/databricks-helpers.R	55.55%	4 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #44 +/- ## ========================================== - Coverage 86.14% 83.77% -2.38% ========================================== Files 22 26 +4 Lines 2577 2742 +165 ========================================== + Hits 2220 2297 +77 - Misses 357 445 +88 ```

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