feat: add function calling for deepseek models (#6990)

api/core/model_runtime/model_providers/deepseek/llm/deepseek-chat.yaml

@@ -5,6 +5,8 @@ label:
 model_type: llm
 features:
   - agent-thought
+  - multi-tool-call
+  - stream-tool-call
 model_properties:
   mode: chat
   context_size: 128000

api/core/model_runtime/model_providers/deepseek/llm/deepseek-coder.yaml

@@ -5,6 +5,8 @@ label:
 model_type: llm
 features:
   - agent-thought
+  - multi-tool-call
+  - stream-tool-call
 model_properties:
   mode: chat
   context_size: 128000