FEAT: Support 5.2- Added composite primary key

[NandanaRaol]

This pull request introduces support for composite primary keys in Django 5.2 and later for the MSSQL backend. It includes changes to conditionally import CompositePrimaryKey, modify DatabaseFeatures, and update schema creation logic to handle composite primary keys.

Support for Composite Primary Keys:

• mssql/features.py: Added conditional import of CompositePrimaryKey based on Django version and updated DatabaseFeatures to include supports_composite_primary_keys. Also set supports_tuple_lookups to False as a fallback when composite primary keys are supported. [1] [2]

• mssql/schema.py: Added conditional import of CompositePrimaryKey and updated the create_model method to detect and handle composite primary keys. This includes generating a PRIMARY KEY SQL clause for composite keys and inserting it into the constraints list during table creation. [1] [2] [3]

[Copilot]

Pull Request Overview

This PR adds support for composite primary keys for the MSSQL backend in Django 5.2 and later. It conditionally imports CompositePrimaryKey, updates database features to reflect composite primary key support, and revises schema creation logic to generate a proper PRIMARY KEY clause for composite keys.

• Introduces conditional imports for CompositePrimaryKey based on the Django version.
• Updates DatabaseFeatures to include composite primary key support and disable tuple lookups when applicable.
• Enhances schema creation logic to handle composite primary keys by generating and inserting a PRIMARY KEY SQL clause.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
mssql/schema.py	Added logic to generate a composite primary key SQL clause during table creation.
mssql/features.py	Conditionally sets support flags for composite primary keys and tuple lookups.

[Copilot]

Misspelling: 'tupple' should be corrected to 'tuple'.

Suggested change

	# Set fallback tupple lookup support
	# Set fallback tuple lookup support

[bewithgaurav]

For this task there is a dependency on subquery lookup using tuple
The support for tuple is subquery lookup is an open PR/Issue as of now in Django Repo - django/django#19565
Will be parking this until that fix is release from Django side

[iamjameswalters]

Looks like django/django#19565 was merged.

@bewithgaurav thanks so much for stepping in to help this project along!