feat(telemetry): capture tool execution errors in OpenTelemetry spans

Introduces ToolExecutionError and ToolErrorType (HTTP status codes) to standardize error reporting for tool failures. Updates trace_tool_call and function execution handlers to extract and record error.type semantics.

Author: Achuth17

tests/unittests/telemetry/test_spans.py

@@ -1176,7 +1176,6 @@ async def test_generate_content_span_with_experimental_semconv(
   assert GEN_AI_CONVERSATION_ID in attributes
   assert attributes[GEN_AI_CONVERSATION_ID] == invocation_context.session.id
 
-
 def test_trace_tool_call_with_tool_execution_error(
     monkeypatch, mock_span_fixture, mock_tool_fixture
 ):
@@ -1255,5 +1254,4 @@ def test_trace_tool_call_with_standard_error(
       error=test_error,
   )
 
-  assert mock.call('error.type', 'ValueError') in mock_span_fixture.set_attribute.call_args_list
-
+  assert mock.call('error.type', 'ValueError') in mock_span_fixture.set_attribute.call_args_list