[TensorRT EP] Clear constrain of trt plugin with different input type (#19044)

### Description
<!-- Describe your changes. -->
Add heterogeneous support to skip this check for TRT plugin which has
different input tensor types



### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->

onnxruntime/core/providers/tensorrt/tensorrt_execution_provider_custom_ops.h

@@ -56,6 +56,14 @@ struct TensorRTCustomOp : Ort::CustomOpBase<TensorRTCustomOp, TensorRTCustomKern
 
   OrtCustomOpInputOutputCharacteristic GetOutputCharacteristic(size_t) const { return OrtCustomOpInputOutputCharacteristic::INPUT_OUTPUT_VARIADIC; };
 
+  bool GetVariadicInputHomogeneity() const {
+    return false;  // heterogenous
+  }
+
+  bool GetVariadicOutputHomogeneity() const {
+    return false;  // heterogeneous
+  }
+
  private:
   const char* provider_{onnxruntime::kTensorrtExecutionProvider};
   void* compute_stream_;