feat: Table type specific PG on conflict behavior

[ferenc-csaky]

Key Changes

• Only relevant logic change in PostgresJdbcEngine
  • Ignore conflicting records for STREAM tables
  • Use the ROWTIME field as on-conflict.timestamp-column for STATE tables if there is a ROWTIME field in the schema
  • Otherwise, default on-conflict behavior
• Refactored ConnectorConf.Context, eliminmated unused variables
• Refactored AbstractJDBCEngine#getConnectorOptions siganture, now it takes the ContextBuilder object so it will be more flexible if we introduce variables
• Adapted snapshots

[codecov]

Codecov Report

❌ Patch coverage is 10.52632% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.00%. Comparing base (6fbf270) to head (c664ff6).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...engine/database/relational/PostgresJdbcEngine.java	0.00%	14 Missing ⚠️
...engine/database/relational/AbstractJDBCEngine.java	33.33%	2 Missing ⚠️
...sqrl/engine/database/relational/IcebergEngine.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2055      +/-   ##
============================================
- Coverage     13.01%   13.00%   -0.02%     
  Complexity      805      805              
============================================
  Files           606      606              
  Lines         17462    17465       +3     
  Branches       2101     2102       +1     
============================================
- Hits           2273     2271       -2     
- Misses        14987    14992       +5     
  Partials        202      202              

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[mbroecheler]

One minor change for DRYness.