Added the following Orchestrator functions from Swagger
- from .orch._license
- get_nx_licensed_appliances
- get_vx_licensed_appliances
- get_portal_licensed_summary
- get_portal_licensed_appliances
- change_appliance_license
- grant_appliance_base_license
- revoke_appliance_base_license
- delete_appliance_license_token
- from .orch._wan_next_hop_health
- get_wan_next_hop_health_config
# Custom certs introduced in Orchestrator 9.0.4+ and Edge Connect 9+
- from .orch._custom_certs
- get_custom_certs
- update_custom_certs
- delete_custom_cert
- get_custom_certs_enabled
- set_custom_certs_enabled
- check_custom_certs_orchestrator_to_portal
- check_custom_certs_appliances_to_portal
- verify_custom_cert
- Updated README with Swagger coverage %