feat: Support Protobuf schemas

[Amzani]

Fixes #885

Works with this document

asyncapi: 3.0.0

info:
  title: Service
  version: 1.0.0
  contact:
    name: Developers
    email: [email protected]

servers:
  development:
    host: localhost:9092
    protocol: kafka
    protocolVersion: 2.6.0
    description: Development Kafka broker.

channels:
  in:
    address: in
    title: Inbox channel
    description: This is the topic for all messages that the Account Service is
      meant to process.
    messages:
      createUser:
        $ref: "#/components/messages/CreateUser"
    servers:
      - $ref: "#/servers/development"

components:
  messages:
    CreateUser:
      name: CreateUser
      summary: A command for creating a user.
      tags:
        - name: Users
      contentType: application/vnd.google.protobuf;version=3
      traits:
        - $ref: "#/components/messageTraits/CloudEventHeaders"
      headers:
        type: object
        properties:
          correlationId:
            description: Correlation ID set by the application.
            type: string
            format: uuid
      correlationId:
        description: Default Correlation ID.
        location: $message.header#/correlationId
      payload:
        schemaFormat: application/vnd.google.protobuf;version=3
        payload: |
            message Point {
                required int32 x = 1;
                required int32 y = 2;
                optional string label = 3;
            }

            message Line {
                required Point start = 1;
                required Point end = 2;
                optional string label = 3;
            }
  messageTraits:
    CloudEventHeaders:
      headers:
        type: object
        required:
          - ce-specversion
          - ce-id
          - ce-source
          - ce-type
        properties:
          ce-specversion:
            type: string
            description: The version of the CloudEvents specification which the
              event uses.
            enum:
              - "1.0"
          ce-id:
            type: string
            minLength: 1
            description: Identifies the event.
          ce-source:
            type: string
            format: uri-reference
            minLength: 1
            description: Identifies the context in which an event happened.
          ce-type:
            type: string
            minLength: 1
            description: Describes the type of event related to the originating
              occurrence.
          ce-datacontenttype:
            type: string
            description: Content type of the data value. Must adhere to
              RFC 2046 format.
          ce-dataschema:
            type: string
            description: Identifies the schema that data adheres to.
          ce-subject:
            type: string
            description: Describes the subject of the event in the context of
              the event producer (identified by source).
          ce-time:
            type: string
            format: date-time
            description: Timestamp of when the occurrence happened.
              Must adhere to RFC 3339.
          content-type:
            type: string
            enum:
              - application/json

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[fmvilas]

LGTM 👍

[Amzani]

/rtm