TensorRT tutorial is missing in master

[aaronmarkham]

Description

So the docs give a 404. https://mxnet.apache.org/versions/1.6/api/python/docs/tutorials/performance/backend/tensorrt/index.html

Here's the old version of it assuming it is still valid for master.
https://github.com/apache/incubator-mxnet/blob/v1.x/docs/python_docs/python/tutorials/performance/backend/tensorrt/tensorrt.md

[ptrendx]

@Kh4L Could you check if the content from 1.x is ok / modify the example to work with the current master?

@aaronmarkham You gave link to 1.6 version, which seems to be there, the one that does not work is the master equivalent: https://mxnet.apache.org/api/python/docs/tutorials/performance/backend/tensorrt/tensorrt

[Kh4L]

@ptrendx @aaronmarkham It has been removed in this PR #18579
cc @eric-haibin-lin

[eric-haibin-lin]

I think there's extra effort to enable tensor-rt integration with the gluon cachedop, as graph executor was dropped in mxnet 2.0