[Improvement] Use SQLite for chat memory (#910)

Co-authored-by: Deven Patel <deven298@yahoo.com>

tests/memory/test_chat_memory.py

@@ -0,0 +1,67 @@
+import pytest
+
+from embedchain.memory.base import ECChatMemory
+from embedchain.memory.message import ChatMessage
+
+
+# Fixture for creating an instance of ECChatMemory
+@pytest.fixture
+def chat_memory_instance():
+    return ECChatMemory()
+
+
+def test_add_chat_memory(chat_memory_instance):
+    app_id = "test_app"
+    human_message = "Hello, how are you?"
+    ai_message = "I'm fine, thank you!"
+
+    chat_message = ChatMessage()
+    chat_message.add_user_message(human_message)
+    chat_message.add_ai_message(ai_message)
+
+    chat_memory_instance.add(app_id, chat_message)
+
+    assert chat_memory_instance.count_history_messages(app_id) == 1
+    chat_memory_instance.delete_chat_history(app_id)
+
+
+def test_get_recent_memories(chat_memory_instance):
+    app_id = "test_app"
+
+    for i in range(1, 7):
+        human_message = f"Question {i}"
+        ai_message = f"Answer {i}"
+
+        chat_message = ChatMessage()
+        chat_message.add_user_message(human_message)
+        chat_message.add_ai_message(ai_message)
+
+        chat_memory_instance.add(app_id, chat_message)
+
+    recent_memories = chat_memory_instance.get_recent_memories(app_id, num_rounds=5)
+
+    assert len(recent_memories) == 5
+
+
+def test_delete_chat_history(chat_memory_instance):
+    app_id = "test_app"
+
+    for i in range(1, 6):
+        human_message = f"Question {i}"
+        ai_message = f"Answer {i}"
+
+        chat_message = ChatMessage()
+        chat_message.add_user_message(human_message)
+        chat_message.add_ai_message(ai_message)
+
+        chat_memory_instance.add(app_id, chat_message)
+
+    chat_memory_instance.delete_chat_history(app_id)
+
+    assert chat_memory_instance.count_history_messages(app_id) == 0
+
+
+@pytest.fixture
+def close_connection(chat_memory_instance):
+    yield
+    chat_memory_instance.close_connection()