Use GET where possible

[razor-x]

Supporting GET for all read-only endpoints is blocked on a few items

• API does not parse all input for GET the same as POST
• The openapi specs does not return GET for all endpoints
• The openapi spec does not include the resource key for GET

Once openapi spec includes the resource key for GET, deriveResourceFromSchemaForGetRequest should be removed from here.

[razor-x]

Depends on #73