refactor!: move drivers into rsql_drivers crate

[brianheineman]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 96.82540% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 95.89%. Comparing base (3aeaa0c) to head (8697481).

Files	Patch %	Lines
rsql_drivers/src/postgres/driver.rs	90.90%	1 Missing ⚠️
rsql_drivers/src/postgresql/driver.rs	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   95.90%   95.89%   -0.02%     
==========================================
  Files          74       75       +1     
  Lines        8283     8232      -51     
==========================================
- Hits         7944     7894      -50     
+ Misses        339      338       -1     

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