feat: improved error messages

[akoumpa]

What does this PR do ?

Changes:

• When from_config/from_pretrained fail, it adds a message to prompt users to upgrade their installed package.
• make nemo_automodel.models alias of nemo_automodel.components.models

Sample error message:

<original HF error about unrecognized model type>

The checkpoint 'org/model' has a model type not recognized by the installed
version of NeMo Automodel. This usually means your installed package is out
of date.

To fix this, try upgrading:
  pip install --upgrade nemo_automodel
or install from source:
  pip install git+https://github.com/NVIDIA-NeMo/Automodel.git

Changelog

• Add specific line by line info of high level changes in this PR.

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• Related to # (issue)

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[akoumpa]

/ok to test 54a8dd7

[akoumpa]

/ok to test 1367cb3

[akoumpa]

/ok to test 26c3bd4