LRA OpenAPI Schema fails as misses references to API version header and parameter

The LRA uses the OpenAPI (SmallRye OpenAPI dependency) annotations to define the Schema of the coordinator.

In the current state the API definition fails to be parsed as there are missing definition for API version which is referenced in the `@APIResponses` tags.
This omission was cause by fact we were changing the Coorindator class to extend directly from Application.

Errors are like

Semantic error at paths./lra-coordinator/lra-coordinator.get.parameters.1.$ref
$refs must reference a valid location in the document
Jump to line 26
Semantic error at paths./lra-coordinator/lra-coordinator.get.responses.200.headers.Narayana-LRA-API-version.$ref
$refs must reference a valid location in the document
Jump to line 32
...