Add Schema Registry for Protocol Buffer Input Format

Currently Protocol Buffers require a .desc file on disk to parse the data. Deprecating the present approach, the user should have the ability to register any proto buf schema using a simple REST API call.
For more details take a look at [Kafka schema registry](https://docs.confluent.io/current/schema-registry/schema_registry_tutorial.html)

No repository files or tests are named. Start by reviewing the current .desc-file approach and the linked Kafka Schema Registry tutorial, then identify the existing Protocol Buffer parsing entry point. Done should include REST registration of schemas, parsing without a disk-based .desc file, and deprecation of the current approach.

Written by the indexing model from the issue text.