WideRowHandling: spanner to source db IT

[akashthawaitcc]

This PR introduces validation checks to enforce various constraints on table and column creation, ensuring compliance with database limitations.
Changes Implemented

Table Name Length Constraint (1 to 128 characters)

• Successfully creates tables with names up to 128 characters.
• Fails for names exceeding 128 characters.

Maximum Columns per Table (1,024)

• Successfully creates tables with up to 1,024 columns.
• Fails for tables exceeding 1,024 columns.

Column Name Length Constraint (1 to 128 characters)

• Successfully creates columns with names up to 128 characters.
• Fails for column names exceeding 128 characters.

String Cell Size Constraint (Max 2,621,440 Unicode characters)

• Successfully creates a table with a string column of 2,621,440 characters.
• Fails when exceeding the limit.

[google-cla]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.18%. Comparing base (6d8c445) to head (90d0bbc).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2252      +/-   ##
============================================
- Coverage     49.19%   49.18%   -0.01%     
- Complexity     4620     4951     +331     
============================================
  Files           924      924              
  Lines         55852    55852              
  Branches       5998     5998              
============================================
- Hits          27475    27472       -3     
  Misses        26403    26403              
- Partials       1974     1977       +3     

Components	Coverage Δ
spanner-templates	70.22% <ø> (-0.02%)	⬇️
spanner-import-export	68.02% <ø> (-0.04%)	⬇️
spanner-live-forward-migration	78.42% <ø> (ø)
spanner-live-reverse-replication	80.40% <ø> (ø)
spanner-bulk-migration	87.77% <ø> (ø)

see 2 files with indirect coverage changes

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[taherkl]

Hi @VardhanThigle PR comments have been resolved. Please review and rerun the pipeline.