[ENH] SQL: Limit tables in dropdown

[VesnaT]

Issue

Ensure better performance when working with large databases by using a searchable dropdown or textfield.

Description of changes

• remove the warning message
• remove the “Download data to local” option
• add a limit of 1000 tables in dropdown
• add radio buttons to switch between Table and Custom SQL

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

❌ Patch coverage is 84.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.02%. Comparing base (9f3d10b) to head (7ae2042).
⚠️ Report is 20 commits behind head on master.

❌ Your patch status has failed because the patch coverage (84.00%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7214      +/-   ##
==========================================
- Coverage   89.03%   89.02%   -0.01%     
==========================================
  Files         335      335              
  Lines       74212    74239      +27     
==========================================
+ Hits        66071    66093      +22     
- Misses       8141     8146       +5     

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