Extract required role and state from API spec

[robin-nitrokey]

The API spec defines the required role and system state for an API call, e. g.:

nethsm-sdk-py/nethsm-api.yaml

Lines 209 to 212 in c1ab14f

	x-annotation-role:
	- Operator
	x-annotation-state:
	- Operational

Currently, there is no way to access this data programmatically. Therefore we to duplicate this information in the code:

nethsm-sdk-py/nethsm/__init__.py

Lines 717 to 718 in c1ab14f

	state=State.OPERATIONAL,
	roles=[Role.OPERATOR],

Ideally, we would extract the information from the API spec, either using the OpenAPI generator or manually, and re-use in the code.