fix(cubesql): Improve DBeaver compatibility

[MazterQyou]

Check List

• Tests have been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

Description of Changes Made

This PR improves compatibility with DBeaver CE. List of issues fixed:

• Added support for pg_get_keypartdef, pg_relation_size system functions
• Added support for pg_shdescription system table
• Fixed placeholder logic to avoid assuming placeholder is a string and infer type from passed oids instead
• Rewritten system queries that use the same column name more than once or use unsupported join conditions

Related tests are included.

[KSDaemon]

👍🏻

[codecov]

Codecov Report

Attention: Patch coverage is 87.44395% with 28 lines in your changes missing coverage. Please review.

Project coverage is 84.28%. Comparing base (185db54) to head (c8e7a38).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
rust/cubesql/cubesql/src/sql/types.rs	0.00%	18 Missing ⚠️
...ne/information_schema/postgres/pg_shdescription.rs	83.63%	9 Missing ⚠️
rust/cubesql/cubesql/src/sql/postgres/shim.rs	95.23%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #9769    +/-   ##
========================================
  Coverage   84.27%   84.28%            
========================================
  Files         232      233     +1     
  Lines       86495    86704   +209     
========================================
+ Hits        72894    73075   +181     
- Misses      13601    13629    +28     

Flag	Coverage Δ
cubesql	84.28% <87.44%> (+<0.01%)	⬆️

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