API: Default tool call ID and type

Doing this helps reduce the model's burden of generating the tool
call ID and type (which is always "function"). Follow mistral's spec
for tool call IDs by using a 9 character alphanumeric string.

Signed-off-by: kingbri <8082010+kingbri1@users.noreply.github.com>

endpoints/OAI/types/tools.py

@@ -1,5 +1,6 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from typing import Dict, Literal
+from uuid import uuid4
 
 
 class Function(BaseModel):
@@ -29,6 +30,6 @@ class Tool(BaseModel):
 class ToolCall(BaseModel):
     """Represents an OAI tool description."""
 
-    id: str
+    id: str = Field(default_factory=lambda: str(uuid4()).replace("-", "")[:9])
     function: Tool
-    type: Literal["function"]
+    type: Literal["function"] = "function"