Create a target dataset for a pipeline

Creates a target dataset for a specified pipeline by providing a set of table mapping IDs. This endpoint submits an asynchronous dataset-creation request.

Process overview:

1. Resource validation - validates that the pipeline exists and belongs to the provided project. If validation fails, the request will be rejected.
2. Request validation - validates that at least one table mapping ID is provided. The IDs must reference existing table mappings in the pipeline.
3. Table mapping retrieval - fetches the actual table mapping details from the pipeline based on the provided IDs. The handler determines the appropriate creation strategy based on the target connection type.
4. Async submission - Dataset creation is performed asynchronously;
5. Monitoring - on successful submission the endpoint returns 202 Accepted with a Location header that points to the dataset creation status endpoint. Clients should poll that endpoint to monitor progress and completion.

Behavior & semantics:

• Idempotency: repeated requests for the same pipeline and identical mapping IDs may be rejected as a conflict if a create operation is already in progress (409).
• Use the returned Location or the GET status endpoint to obtain the current dataset creation status.

Required Permissions: Either replication-pipeline::create or replication-pipeline::update when permission harmonization is enabled; otherwise, replication-pipeline::manage.