Replace drf-yasg with drf-spectacular

[annashamray]

Tasks:

• [x] Replace drf-yasg custom inspectors with drf-yasg extensions
• [x] Keep the support of all existing schema customization, including error responses, separate content type for error responses, security definition, headers...
• [x] Add tests for schema generation

What to keep and refactor:

• field inspectors to field extensions:
  • [x] geometry field
  • [x] gegevensgroep
  • [x] base64 file (optional, used only in Open Zaak i think )
  • [x] hyperlink identity field
• serializer inspectors to extensions:
  • [x] polymorphic
• query inspectors to extensions:
  • [x] camelize names
• autoschema customization:
  • [x] add error responses
  • [x] separate content type for error responses
  • [x] customize operation_id (optional, can be done later)
  • [ ] search request serializer (optional)
  • [x] content-type header
  • [x] geo headers
  • [x] version header
  • [x] cache (eTag) headers and HEAD action description
  • [ ] audittrail headers
  • [x] location header

[stevenbal]

@bart-maykin it might be good to use the overrides made in this PR and move them to commonground-api-common as well https://github.com/open-zaak/open-notificaties/pull/145#discussion_r1592460424 (if they aren't in Chris' PR already)

[joeribekker]

Refinement: Anna and Bart will discuss this to resolve issues.