fix: Remove gptqmodel Warning on startup

[BrandonGroth]

Description of the change

This change removes the warning for gptqmodel, as well as adds additional safeguards for the optional dependency.
Also, this fixes a minor bug with the available_package check in modules/linear.py, as it was checking for the auto_gptq external kernels instead of gptqmodel's version.

Related issues or PRs

Closes #99

How to verify the PR

On main:

python3
>>> import fms_mo
GPTQModel is not properly installed. QLinearExv1WI4AF16 and QLinearExv2WI4AF16 wrappers will not be available.
>>> 

This PR:

python3
>>> import fms_mo
>>> 

Was the PR tested

• I have added >=1 unit test(s) for every new method I have added (if that coverage is difficult, please briefly explain the reason)
• I have ensured all unit tests pass

Checklist for passing CI/CD:

• All commits are signed showing "Signed-off-by: Name <email@domain.com>" with git commit -signoff or equivalent
• PR title and commit messages adhere to Conventional Commits
• Contribution is formatted with tox -e fix
• Contribution passes linting with tox -e lint
• Contribution passes spellcheck with tox -e spellcheck
• Contribution passes all unit tests with tox -e unit

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