Adds schema support to audit triggers/functions

[nlocascio]

Ensures audit tables, functions, and triggers are created in the
same schema as the audited table.

Allows specifying a schema in the @audit decorator, which overrides
the table's schema.

This enables auditing in multi-schema environments by correctly
qualifying function names when creating triggers.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.83%. Comparing base (669ee45) to head (31d2756).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #135   +/-   ##
=======================================
  Coverage   89.83%   89.83%           
=======================================
  Files          86       86           
  Lines        4111     4112    +1     
  Branches      856      856           
=======================================
+ Hits         3693     3694    +1     
  Misses        338      338           
  Partials       80       80           

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