Improved config options for OIDC (#9)

Added many new configuration options, including claim configuration and client_secret/confidential client support. Also enables user linking & creates person entries upon first sign in.

custom_components/auth_oidc/endpoints/welcome.py

@@ -14,7 +14,10 @@ class OIDCWelcomeView(HomeAssistantView):
     url = PATH
     name = "auth:oidc:welcome"
 
+    def __init__(self, name: str) -> None:
+        self.name = name
+
     async def get(self, _: web.Request) -> web.Response:
         """Receive response."""
-        view_html = await get_view("welcome")
+        view_html = await get_view("welcome", {"name": self.name})
         return web.Response(text=view_html, content_type="text/html")