Add Dell Enterprise SONiC 'mfa' module

[Divya-N3]

SUMMARY

Add Enterprise SONiC 'mfa' resource module:

• Provide data definitions in 'argspec'.
• Implement 'facts' to gather facts for the module.
• Implement 'config' to apply configurations for merged, deleted, replaced and overridden states.
• Implement support for 'check' and 'diff' modes.
• Define regression test cases to verify correct functionality of mfa resource module.

GitHub Issues

List the GitHub issues impacted by this PR. If no Github issues are affected, please indicate this with "N/A".

GitHub Issue #
N/A

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

• sonic_mfa

OUTPUT

ADDITIONAL INFORMATION

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility or have provided any relevant "breaking_changes" descriptions in a "fragment" file in the "changelogs/fragments" directory of this repository.
• I have provided a summary for this PR in valid "fragment" file format in the "changelogs/fragments" directory of this repository branch. Reference : Ansible Change Log Document

Regression report:
regression-2025-11-22-19-48-51.pdf

[stalabi1]

Please add an entry for this module in meta/runtime.yml and create a symlink.
cd plugins/action
ln -s sonic.py mfa.py

(Resolved)

[kerry-meyer]

The proposed changes and corresponding test results look good.

I am requesting a few minor changes to be applied before final approval and merging of this PR.

[kerry-meyer]

In addition to making the changes requested via inline comments, please do a regression test run using the instructions posted on the "https://dell.enterprise.slack.com/archives/C0430MPKS8Z" Slack channel and post the resulting output on this PR.

The files and instructions are in the postings on 4/8 and 4/22.

[kerry-meyer]

Thank you for posting updates for the inline comments I posted. I have resolved all of the associated "Issues" based on the updates that have been pushed to the PR branch.

A fix for the sanity errors flagged recently for all modules was merged today and your latest changes should eliminate these failures for the MFA module. If you resync the 'main' branch of your fork, then resync this PR branch from your fork "main" branch, that should allow all sanity tests to pass.

This PR can be approved and merged after an updated regression test report with "check" mode and "diff" mode output is attached.