fix: serialize Pydantic models in request body

Issue:
- ExtraInfo class instance submitted as the extra_info parameter is not serialized and
results in: "TypeError: Object of type ExtraInfo is not JSON serializable"

This fix will:
- Serialize BaseModel instances.
- Exclude None values (automatically populated for defined model properties and rejected
by the API)

This will allow users to pass as extra_info parameter:
- ExtraInfo instance (as hinted)
- Dictionary

Author: lapinek

src/crowdstrike_aidr/services/ai_guard.py

@@ -4,6 +4,7 @@
 from typing import Literal
 
 import httpx
+from pydantic import BaseModel
 
 from .._client import SyncAPIClient, make_request_options
 from .._types import Body, Headers, NotGiven, Omit, Query, not_given, omit
@@ -12,7 +13,15 @@
 
 
 def _transform_typeddict(data: Mapping[str, object]) -> Mapping[str, object]:
-    return {key: value for key, value in data.items() if is_given(value)}
+    result = {}
+    for key, value in data.items():
+        if is_given(value):
+            # Serialize Pydantic models to dict, excluding None values
+            if isinstance(value, BaseModel):
+                result[key] = value.model_dump(exclude_none=True)
+            else:
+                result[key] = value
+    return result
 
 
 class AIGuard(SyncAPIClient):