Attempt to use the UiPageProvider to configure endpoints

Co-authored-by: June june@jsts.xyz

README.md

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+What does this Keykloak Provider do?
+
+Export an anonymized list of User-Attribute values.
+This provider will provide an api endpoit for every configured attribute-group.
+Multivalues attribues are not supported (yet).
+
+
+
+Configuration in Keykloak
+
+- Client with Service-Account
+  - Assigned roles allow access to attribute export
+- User profile Groups with attributes
+
+
+```json
+{
+    "endpoints": [
+        {
+            "slug": "myattribute",
+            "attribute-group": "myattributes",
+            "match-role": "myattribute-access",
+            "auth-role": "myattribute-export",
+            "attribute-regex": "^(?<key>(ssh-ed25519 AAAAC3NzaC1lZDI1NTE5|ssh-rsa AAAAB3NzaC1yc2)[0-9A-Za-z+/]+[=]{0,3})(\\s.*)?$",
+        }
+    ]
+}
+```
+
+
+
+We recommend using a client with service-account, but you can also use a bot-account to authenticate against the provider.