Implement the 'dev' API version to provide the nightly updates

Context

Although the RAFSDDMS is publicly released and available, the community still intensively works on developing and improving the service. The API contracts and data models change, and new functionality is added.

Bumping the API version on each backward incompatible request might cause challenging API management. Having a development version of the API could solve the issue.

Scope

1. Register the 'dev' API version
2. Add tests
3. Update documentation