Use Slash Commands and Add Notes Slash Command (#463)

* Store conversation command options in an Enum

* Move to slash commands instead of using @ to specify general commands

* Calculate conversation command once & pass it as arg to child funcs

* Add /notes command to respond using only knowledge base as context

This prevents the chat model to try respond using it's general world
knowledge only without any references pulled from the indexed
knowledge base

* Test general and notes slash commands in openai chat director tests

* Update gpt4all tests to use md configuration

* Add a /help tooltip

* Add dynamic support for describing slash commands. Remove default and treat notes as the default type

---------

Co-authored-by: sabaimran <narmiabas@gmail.com>

tests/test_openai_chat_director.py

@@ -1,9 +1,11 @@
 # Standard Packages
 import os
+import urllib.parse
 
 # External Packages
 import pytest
 from freezegun import freeze_time
+from khoj.processor.conversation import prompts
 
 # Internal Packages
 from khoj.processor.conversation.utils import message_to_log
@@ -168,6 +170,57 @@ def test_no_answer_in_chat_history_or_retrieved_content(chat_client):
     )
 
 
+# ----------------------------------------------------------------------------------------------------
+@pytest.mark.chatquality
+def test_answer_using_general_command(chat_client):
+    # Arrange
+    query = urllib.parse.quote("/general Where was Xi Li born?")
+    message_list = []
+    populate_chat_history(message_list)
+
+    # Act
+    response = chat_client.get(f"/api/chat?q={query}&stream=true")
+    response_message = response.content.decode("utf-8")
+
+    # Assert
+    assert response.status_code == 200
+    assert "Fujiang" not in response_message
+
+
+# ----------------------------------------------------------------------------------------------------
+@pytest.mark.chatquality
+def test_answer_from_retrieved_content_using_notes_command(chat_client):
+    # Arrange
+    query = urllib.parse.quote("/notes Where was Xi Li born?")
+    message_list = []
+    populate_chat_history(message_list)
+
+    # Act
+    response = chat_client.get(f"/api/chat?q={query}&stream=true")
+    response_message = response.content.decode("utf-8")
+
+    # Assert
+    assert response.status_code == 200
+    assert "Fujiang" in response_message
+
+
+# ----------------------------------------------------------------------------------------------------
+@pytest.mark.chatquality
+def test_answer_not_known_using_notes_command(chat_client):
+    # Arrange
+    query = urllib.parse.quote("/notes Where was Testatron born?")
+    message_list = []
+    populate_chat_history(message_list)
+
+    # Act
+    response = chat_client.get(f"/api/chat?q={query}&stream=true")
+    response_message = response.content.decode("utf-8")
+
+    # Assert
+    assert response.status_code == 200
+    assert response_message == prompts.no_notes_found.format()
+
+
 # ----------------------------------------------------------------------------------------------------
 @pytest.mark.xfail(AssertionError, reason="Chat director not capable of answering time aware questions yet")
 @pytest.mark.chatquality