feat: GPTQv2 enablement for fms_mo

[bayo-ibm]

Description of the change

This enables GPTQv2 for fms_mo

1. Added new gptq arguments
2. Changed the Readme file for the GPTQ example to reflect the changes

Related issues or PRs

NA

How to verify the PR

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 protected]>" 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

Note: CI/CD performs unit tests on multiple versions of Python from a fresh install. There may be differences with your local environment and the test environment.