Add GenerateContentResponse.to_dict() (#337)

* GenerateContentResponse.to_dict()

Change-Id: I2042d4387fe216f28b9c48b98eab8a71447fb98f

* docstring

Change-Id: Icec923e7d782ef5e6c2e36faefe790ea01ed93ad

Author: MarkDaoust

google/generativeai/types/generation_types.py

@@ -356,6 +356,18 @@ def __init__(
         else:
             self._error = None
 
+    def to_dict(self):
+        """Returns the result as a JSON-compatible dict.
+
+        Note: This doesn't capture the iterator state when streaming, it only captures the accumulated
+        `GenerateContentResponse` fields.
+
+        >>> import json
+        >>> response = model.generate_content('Hello?')
+        >>> json.dumps(response.to_dict())
+        """
+        return type(self._result).to_dict(self._result)
+
     @property
     def candidates(self):
         """The list of candidate responses.
@@ -428,7 +440,7 @@ def __str__(self) -> str:
         else:
             _iterator = f"<{self._iterator.__class__.__name__}>"
 
-        as_dict = type(self._result).to_dict(self._result)
+        as_dict = self.to_dict()
         json_str = json.dumps(as_dict, indent=2)
 
         _result = f"glm.GenerateContentResponse({json_str})"