* Add support for Enums to be part of the Path and Query
Supports optional Query Enums and Lists of Enums as well
Add an example endpoint that covers the added scenarios
Added an import mapping for the GoServerCodegen for "fmt"
when a model is an enum.
Expanded the Enum Model for the Go Server to have validation.
Copied this logic from the Go Client Enum Model.
* Fix identation of examples
* Pre-allocate the capacity of the slice of Enums to be
the correct size.
* Formatting and updated examples
* Empty-Commit
* Switch to using a map to store the valid enum values
* Fixed pointer derefs missed from previous change in PR
* More fixing of pointer to not pointer
* Create a map for validation and a list of enums for messaging
* Partitally reverts #15185
* Remove unused import
* Set zero value if param is empty
* Refactor samples, add test config
* Add tests
* Clean up
* Fix test
