Add fallback and fast_rate attributes to LAG interfaces module

[stalabi1]

SUMMARY

I added fallback and fast_rate attributes to the LAG interfaces module.

GitHub Issue #
#454

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

sonic_lag_interfaces

OUTPUT

regression-2024-10-15-13-01-36.html.pdf
facts_gathering.log
diff_output.log
merge_lag.log
delete_lag.log

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 80% 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

[ArunSaravananBalachandran]

Please skip usage of 'format string', since it resulted in a pylint failure in python 2.7 during an earlier release in ansible automation hub. (Ref: #434)

[stalabi1]

Removed f-strings.