Neuron Image URI config file is out of date

[mmcclean-aws]

Describe the bug
The config file src/sagemaker/image_uri_config/pytorch-neuron.json is out of date as it is missing many of the pre-built containers that are described here: https://github.com/aws/deep-learning-containers/blob/master/available_images.md#neuron-containers

Also, is there a TensorFlow config file for Neuron ?

To reproduce
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Expected behavior
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Update the JSON file with the newest container images for Neuron.

Screenshots or logs
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System information
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• SageMaker Python SDK version:
• Framework name (eg. PyTorch) or algorithm (eg. KMeans):
• Framework version:
• Python version:
• CPU or GPU:
• Custom Docker image (Y/N):

Additional context
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[knikure]

@saimidu Can we have the config updated in SDK?