Support for `content` in Response headers on UI, add mediatype to Header Parameters

Describe the problem to be solved The current UI does not display the schema from a content keyword defined in Response headers.

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If I use the same structure in Parameters, it seems to work as expected but it's missing the content type definition.

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This small description should be derived from the mediatype mapping name

I think a reasonable location for this is just below the header/parameter name

Describe the solution you'd like

Display it similar to the Parameters section, with the media type and the schema definition.

Describe alternatives you've considered none

Additional context

openapi: 3.1.0
info:
  title: Example
  version: '0.0.1'
servers:
  - url: https://example.org
paths:
  '/foo/{example}':
    get:
      description: a sample URI
      parameters:
        - name: x-my-header
          in: header
          description: my custom header definition
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
                  additionalProperties: false
                  properties:
                    level:
                      enum:
                      - info
                      - warn
                      - error
                    message:
                      type: string
      responses:
        '200':
          description: OK
          headers:
            x-my-header:
              description: my custom header definition
              content:
                application/json:
                  schema:
                    type: array
                    items:
                      type: object
                      additionalProperties: false
                      properties:
                        level:
                          enum:
                          - info
                          - warn
                          - error
                        message:
                          type: string
          content:
            'application/json':
              schema: {}
        '400':
          description: Bad Request
          content: 
            'application/json':
              schema: {}