fix(cubesql): Functions without arguments alias as plain function name

[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 fixes an issue with functions being aliased as the expression when no alias is specified. For instance, the query SELECT version() would name the resulting column version() instead of version like PostgreSQL does. Related tests are adjusted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.76%. Comparing base (dc5dec9) to head (47c78b6).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9338   +/-   ##
=======================================
  Coverage   83.76%   83.76%           
=======================================
  Files         229      229           
  Lines       82696    82696           
=======================================
  Hits        69267    69267           
  Misses      13429    13429           

Flag	Coverage Δ
cubesql	83.76% <100.00%> (ø)

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