[ENH] - Fetch user display name, initials and other details

[krassowski]

Feature description

Nebari/jhub-apps are configured to use email address as username. The email address is taking up a lot of space and making the UI cumbersome to use in places like shared apps cards.

Value and/or benefit

Exposing a display name, name, and initials would allow for better user experience.

Anything else?

This will be three steps:

1. Make JupyterHub support these details and return them in /user endpoint (if maintainers agree)
2. Make Keycloak feed these details to JupyterHub
3. Add extra fields to user model:
   

   jhub-apps/jhub_apps/service/models.py

   Lines 22 to 32 in a9bab8f

   	class User(BaseModel):
   	name: str
   	admin: bool
   	groups: Optional[List[str]]
   	kind: str
   	server: Optional[str] = None
   	pending: Optional[str] = None
   	last_activity: Optional[datetime] = None
   	servers: Optional[Dict[str, Server]] = None
   	scopes: List[str]
   	auth_state: Optional[Dict] = None

I suspect nothing else will be needed on jhub-apps side since it just feeds the /user response to the model:

jhub-apps/jhub_apps/service/security.py

Lines 55 to 73 in a9bab8f

	endpoint = "/user"
	# normally we auth to Hub API with service api token,
	# but this time auth as the user token to get user model
	headers = {"Authorization": f"Bearer {token}"}
	resp = await client.get(endpoint, headers=headers)
	if resp.is_error:
	raise HTTPException(
	status.HTTP_401_UNAUTHORIZED,
	detail={
	"msg": "Error getting user info from token",
	"request_url": str(resp.request.url),
	"token": token,
	"response_code": resp.status_code,
	"hub_response": resp.json(),
	},
	)
	user = User(**resp.json())
	if any(scope in user.scopes for scope in access_scopes):
	return user