Allow providing additional parameters to FastAPIs add_api_route() function

[AndreasMietk]

Currently the internal _add_api_route() function is implemented with **kwargs which is passed to FastAPIs add_api_route()

Unfortunately its not possible to add any **kwargs, because all the CRUD functions aren't utilising it.

I came to this issue because i use the OpenAPIGenerator which translates the opertaion_id argument as the function being called.

If it is not provided, the generated function name is very ugly such as routeActivitiesItemIdPut for and update function.