Updates the version of oapi-codegen which is installed via
the buildtools to our v1.11.0 prerelease. Also changes the
Makefile targets and adds config files which are the preferred
way of configuration instead of the old CLI flags.

The generated types definitions have also been updated using
the oapi-codegen commit which ensures all required Enums are generated
for enums embedded in response types.

…port-changes

Moves all types.go to a single model package within the v2 generated API code. Also
moves the oapi-codegen config file for each of the generated packages alongside the code
it is generating. Additionally, we've moved the generated routes.go into a public package
instead of the top level generated package.

The result of this is a large refactoring of imports. generated=>models,
generatedV2=>models, and generated=>public in the case of the router.

…port-changes

…port-changes