RND-19109: Add buyer_seller to python sdk

[FenderStrat85]

RELATED TICKETS

• jira links here

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CHANGELOG

• Add buyer/seller filters to sdk

TESTS

• Test buyer/seller filters and exclusions are working correctly

COMMENTS

• any other business

[Copilot]

Pull request overview

Adds buyer/seller filtering support to the Cargo Movements search endpoint in the Python SDK, and extends the CargoMovement trade schema/fixtures to include buyer/seller metadata.

Changes:

• Add filter_buyer/filter_seller and exclude_buyer/exclude_seller parameters to CargoMovements.search().
• Extend CargoMovementTradeEntry to include buyer/seller-related fields (e.g., buyer_id, seller_id, contract_type, delivery_method).
• Update cargo movement fixtures and flattening tests to cover the new trade fields.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
vortexasdk/endpoints/cargo_movements.py	Adds buyer/seller filter + exclude parameters and passes them through to the API request.
vortexasdk/api/cargo_movement.py	Extends the trade entry model with buyer/seller metadata fields and related Literal types.
tests/endpoints/test_cargo_movements_real.py	Adds real-API tests for buyer/seller filtering and exclusion.
tests/api/test_cargo_movement.py	Updates model/flattening expectations to include new trade fields.
tests/api/examples/cargo_movements.json	Extends example payload with buyer/seller fields on a trade entry.

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