MPP-3799: Add schemas to API views for phones

[jwhitlock]

Add the schema details for the phones views. No changes have been made to the API code. In the future, they can be updated to use the new serializers created for documentation purposes.

How to test

With PHONES_ENABLED=True:

• In the browsable API at http://127.0.0.1:8000/api/v1/docs/, views are grouped, and each view function has documentation and examples
  • phones: Outbound
    • POST /api/v1/call/
    • POST /api/v1/message/
    • POST /api/v1/messages/
  • phones: Twilio
    • POST /api/v1/inbound_call/
    • POST /api/v1/inbound_sms/
    • POST /api/v1/sms_status/
    • POST /api/v1/voice_status/
  • phones
    • The CRUD views for /api/v1/inboundcontact/, /api/v1/realphone/, and /api/v1/relaynumber are unchanged. The changed views:
    • POST /api/v1/realphone/resend_welcome_sms
    • GET /api/v1/relaynumber/search/
    • GET /api/v1/relaynumber/suggestions/
    • GET /api/v1/vCard/{lookup_key}/

With IQ_ENABLED=True, an additional group is available, between "phones: Twilio" and "phones":

• phones: Inteliquent
  • POST /api/v1/inbound_sms_iq

When running ./manage.py check --deploy, no views in api/views/phones.py have a drf_spectacular.W002 warning.

[groovecoder]