Support for Azure API Management

[nojaf]

Nice to have: support for API Management:
https://docs.microsoft.com/en-us/azure/templates/microsoft.apimanagement/allversions

Looks like a lot of work though, so no hard feelings if this does not seem worth the effort.

[g2udevelopment]

@isaacabraham is it a possibility to first implement the basic service resource. All the extra resources are mainly for defining API endpoint. If so I could take a shot at this one.