Create/Get prem-service api-key

[sekulicd]

Description:
In the service description page, add an option to create/get API keys for individual services.

Endpoint:
No DNS -> POST http://{IP}/authd/auth/api-key
With DNS -> POST https: //authd.{domain}/auth/api-key
Note: The Authorization header should contain the root api_key from the login step.
Check bellow body example:

{
    "service_name":"gpt4all-lora-q4",
    "requests_per_range":10,
    "range_in_minutes": 1
}

Reference:
Please refer to the related premAI-io/prem-gateway#21 for further details.

@tiero @filopedraz @Janaka-Steph