Merlin inference container size too big

[sohn21c]

Merlin inference container size, when built per https://github.com/NVIDIA-Merlin/Merlin/blob/main/docker/dockerfile.tri, is ~20GB which is big where some cloud services require container size to be limited under 10 or 15GB. A potential resolution could be to create inference containers for different framework using tf2, pyt triton base image instead of triton-py3 that contains all of backends i.e. Tensorflow, PyTorch, TensorRT, ONNX and OpenVINO.

[kylemcmearty]

@sohn21c Which cloud provider did you try this on?
Looks like Azure is 15 GB like you mentioned.

[sohn21c]

@kmcmearty GCP

[rnyak]

@albert17 @jperez999 for viz.

[albert17]

@kmcmearty @sohn21c Working on fixing this. Created a PR