fix: Handle unnamed parameters during normalization and CREATE statements.

[DanCardin]

Fixes #129

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.81%. Comparing base (3ca08f0) to head (7ae6f85).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...arative_extensions/dialects/postgresql/function.py	87.50%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
- Coverage   89.84%   89.81%   -0.03%     
==========================================
  Files          86       86              
  Lines        4056     4065       +9     
  Branches      841      843       +2     
==========================================
+ Hits         3644     3651       +7     
- Misses        335      336       +1     
- Partials       77       78       +1     

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