Support protobuf schema parser

[smoya]

Reason/Context

https://github.com/asyncapi/protobuf-schema-parser is a Schema parser for protobuf. Adding support for it is needed in order to generate using documents that contain schemas in that format.

Description

In order to support that, we need to add that to the dependencies + register it in the Parser as we do with the rest here.

cc @GreenRover

[derberg]

already done