Add Server TCK for Oracle Cloud Function HTTP

[andriy-dmytruk]

This PR adds Micronaut Server TCK for Oracle Cloud Function HTTP.

Currently, 10 of 188 tests (5%) fail.

Fixes:

• Making the request implementation mutable to support filters.
• Allow empty response when an exception is thrown micronaut-servlet#737
• Add support for parsing form data and support empty values in the form data.
• Support binding publisher when there is only one element.
• Support binding body parts for JSON case (so binding JSON properties).
• Fix reading cookies from headers.

Created issues:

• Function Server TCK: Body has already been consumed exception #921
• Function Server TCK: ControllerConstraintHandlerTest failing because of getBody() #925
• Function Server TCK: RequestFilterTest failing #926

[andriy-dmytruk]

I think this is ready to be merged. 10 tests are failing now. The JSON error tests are not passing for any non-netty implementation. And the other tests are covered by separate issues.