Add Support for AWS Bedrock (#1408)

### What problem does this PR solve?

#308 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: KevinHuSh <kevinhu.sh@gmail.com>

rag/llm/__init__.py

@@ -31,7 +31,8 @@ EmbeddingModel = {
     "BaiChuan": BaiChuanEmbed,
     "Jina": JinaEmbed,
     "BAAI": DefaultEmbedding,
-    "Mistral": MistralEmbed
+    "Mistral": MistralEmbed,
+    "Bedrock": BedrockEmbed
 }
 
 
@@ -58,7 +59,8 @@ ChatModel = {
     "VolcEngine": VolcEngineChat,
     "BaiChuan": BaiChuanChat,
     "MiniMax": MiniMaxChat,
-    "Mistral": MistralChat
+    "Mistral": MistralChat,
+    "Bedrock": BedrockChat
 }