feat: One App (#635)

Co-authored-by: Taranjeet Singh <reachtotj@gmail.com>

embedchain/apps/Llama2App.py

@@ -1,15 +1,14 @@
+import logging
 from typing import Optional
 
-from embedchain.apps.custom_app import CustomApp
+from embedchain.apps.app import App
 from embedchain.config import CustomAppConfig
-from embedchain.embedder.openai import OpenAIEmbedder
 from embedchain.helper.json_serializable import register_deserializable
 from embedchain.llm.llama2 import Llama2Llm
-from embedchain.vectordb.chroma import ChromaDB
 
 
 @register_deserializable
-class Llama2App(CustomApp):
+class Llama2App(App):
     """
     The EmbedChain Llama2App class.
 
@@ -17,17 +16,23 @@ class Llama2App(CustomApp):
     add(source, data_type): adds the data from the given URL to the vector db.
     query(query): finds answer to the given query using vector database and LLM.
     chat(query): finds answer to the given query using vector database and LLM, with conversation history.
+
+    .. deprecated:: 0.0.59
+    Use `App` instead.
     """
 
     def __init__(self, config: CustomAppConfig = None, system_prompt: Optional[str] = None):
         """
+        .. deprecated:: 0.0.59
+        Use `App` instead.
+
         :param config: CustomAppConfig instance to load as configuration. Optional.
         :param system_prompt: System prompt string. Optional.
         """
-
-        if config is None:
-            config = CustomAppConfig()
-
-        super().__init__(
-            config=config, llm=Llama2Llm(), db=ChromaDB(), embedder=OpenAIEmbedder(), system_prompt=system_prompt
+        logging.warning(
+            "DEPRECATION WARNING: Please use `App` instead of `Llama2App`. "
+            "`Llama2App` will be removed in a future release. "
+            "Please refer to https://docs.embedchain.ai/advanced/app_types#llama2app for instructions."
         )
+
+        super().__init__(config=config, llm=Llama2Llm(), system_prompt=system_prompt)