feat(cubesql): Fill pg_description table with cube and members descriptions

[mcheshkov]

Check List

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

Description of Changes Made (if issue reference is not provided)

Fill pg_catalog.pg_description table as if descriptions to cubes/dimensions/measures/segmetns were added with COMMENT ON. https://www.postgresql.org/docs/16/sql-comment.html

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.59%. Comparing base (46b3a36) to head (99df4f7). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8618      +/-   ##
==========================================
+ Coverage   82.58%   82.59%   +0.01%     
==========================================
  Files         210      210              
  Lines       77148    77175      +27     
==========================================
+ Hits        63709    63741      +32     
+ Misses      13439    13434       -5     

Flag	Coverage Δ
cubesql	82.59% <100.00%> (+0.01%)	:arrow_up:

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