Added TRT config for inference (#1907)

### Description
Added TRT config for MAISI and the extension of the inference script to
handle extra config file.

Note: autoencoder.decoder currently cannot be exported to TRT (crashes
during engine generation).
It does not seem to take a big part of the whole run anyway.

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Signed-off-by: Boris Fomitchev <bfomitchev@nvidia.com>
Co-authored-by: Yiheng Wang <68361391+yiheng-wang-nv@users.noreply.github.com>