[Feature] LinkML Schema Service: Validate LinkML Metadata against a Stored Schema

[infispiel]

Feature Description

Taken from #1856
Child of #1794

POST requests made to /schemas/{id}/validate should:

1. Confirm that the metadata provided has a metadata_format and engine that are supported by the current microservice
2. Confirm that the metadata_format and engine match the specified schema's schema_format and engine.
3. Validate that the provided metadata fulfills all requirements described by the schema specified.

Functional Requirements

• Throw an unprocessable content error if requirement 1, 2 are not fulfilled
• Throw descriptive errors if requirement 3 fails
• Success otherwise

Changes

N/A