Add QoS scheduler module

[stalabi1]

SUMMARY

I added the QoS scheduler module.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

sonic_qos_scheduler

OUTPUT

regression-2024-04-30-09-49-05.html.pdf
diff_output.log
facts_gathering.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 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.

[kerry-meyer]

The code structure, new tests, and test results look good.

I have posted several comments, but most of them are minor and none require any big changes.

[kerry-meyer]

Thank you for making the final set of incremental changes.

The revised change set and all revised posted test results look good.

Approved.