Create a new accession

Creates a new accession record with the provided attributes.
The payload must include the lab ID and client ID.
Additional optional attributes allow for associating users, vets, carriers, and various other data.
Upon creation, the accession status is set to SHIPPED and the submission timestamp is recorded.
A pre-accession reference number is generated for tracking purposes.

Required Permission: Controller: api_v2_accessions, Action: create.

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