Starlette APP cors setting only permits GET requests

[ptomasula]

Description
The Starlette app with setting cors=true enables all origins, but only permits requests with the GET method. OPTIONS requests with other methods return a 400 response.

Steps to Reproduce

1. Initialize an instance of the Starlette APP with config setting server.cors=true
2. Issue an OPTIONS request for a valid endpoint against the Starlette APP, setting both origin and Access-Control-Request-Method headers. *Note Access-Control-Request-Method should be something other than GET.
3. Check the server response, which should be a 400 - Disallowed CORS method

Expected behavior
Enabling the server.cors setting should enable common request methods for all origins.

Screenshots/Tracebacks

Environment

• OS: Windows 11
• Python version: Python 3.11.5
• pygeoapi version: 0.18.dev0