Django-clickhouse-backend

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- ID worker interface changes and configuration item adjustments.
- Support database connection pool.
- Refactored the implementation of Engine to be more concise and stable.
- Database related features are concentrated in the SQLCompiler implementation.
- Ignore unsupported field-level db_index attribute, and AlterUniqueTogether migration operation in favor of django built-in model or 3rd party model migration.

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- matches Django 4.x.

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- Fixed searching for GenericIPAddressField field.

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- Fixed an issue where multiple order by fields were wrong when creating a table.

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- Fixed AlterField migration to support Nullable to non-Nullable type changes, update old `NULL` values with provided defaults.

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- Support field type change migration