Add standalone DuckDB dialect with translations

[ferenc-csaky]

Key Changes

• Introduce a standalone DuckDbSqlDialect instead of reusing our ExtendedPostgresSqlDialect as is for DuckDB
• Wire in the new dialect in DuckDbStatementFactory
• Some package refactoring under ddl
• Add function-translation/duckdb integration test usecase
• Introduce DuckDB SQL translations so we are covering functions we already test for Postgres

[codecov]

Codecov Report

❌ Patch coverage is 0.49875% with 399 lines in your changes missing coverage. Please review.
✅ Project coverage is 12.86%. Comparing base (cda341c) to head (b6c9fdc).
⚠️ Report is 14 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...function/translation/PostgresLikeTranslations.java	0.00%	85 Missing ⚠️
...ation/duckdb/builtin/DateFormatSqlTranslation.java	0.00%	61 Missing ⚠️
...tion/duckdb/builtin/DuckDbSqlTranslationUtils.java	0.00%	24 Missing ⚠️
...lation/duckdb/builtin/ArrayJoinSqlTranslation.java	0.00%	23 Missing ⚠️
...ion/duckdb/builtin/TimestampAddSqlTranslation.java	0.00%	23 Missing ⚠️
...tasqrl/calcite/dialect/BasePostgresSqlDialect.java	0.00%	16 Missing ⚠️
...nslation/duckdb/builtin/ElementSqlTranslation.java	0.00%	14 Missing ⚠️
.../translation/duckdb/builtin/EltSqlTranslation.java	0.00%	14 Missing ⚠️
...com/datasqrl/calcite/dialect/DuckDbSqlDialect.java	0.00%	13 Missing ⚠️
...tion/duckdb/builtin/ArrayRemoveSqlTranslation.java	0.00%	11 Missing ⚠️
... and 37 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1866      +/-   ##
============================================
- Coverage     13.09%   12.86%   -0.23%     
- Complexity      734      735       +1     
============================================
  Files           549      580      +31     
  Lines         16126    16427     +301     
  Branches       1894     1913      +19     
============================================
+ Hits           2112     2114       +2     
- Misses        13821    14120     +299     
  Partials        193      193              

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