[TensorRT EP] Fix mem leak for TRT plugins custom ops#19248
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jywu-msft
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TRT EP's GetTensorRTCustomOpDomainList() will create vector of OrtCustomOpDomain objects and release the ownership of those objects. But, thoses objects are not released forever. In session level, we need to make TRT EP remember what OrtCustomOpDomain objects it created and release them at EP destruction time.
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Old TRT EP's GetTensorRTCustomOpDomainList() will create vector of OrtCustomOpDomain objects and release the ownership of those objects. But, those objects are never being released.
Use the static unique_ptr to make sure those custom op objects are properly released.