[Enhancement] Scheduler plugin revisit and enhancement

[RainbowMango]

Summary

The current scheduler in our system includes several in-tree scheduling plugins, such as score plugins and filter plugins. Additionally, it allows users to extend functionality through out-of-tree plugins, enhancing the scheduler's capabilities. Recently, there have been discussions around these plugins (e.g., #6022).

This issue aims to document and track a systematic review of these plugins, covering the following aspects:

1. Revisit the design of existing in-tree plugins.
2. Decide whether each plugin should be retained or deprecated based on its relevance and utility.
3. Determine if there is a need for new plugins to address emerging requirements or gaps.
4. Evaluate which in-tree plugins should be enabled by default. (Not all in-tree plugins necessarily need to be activated by default)
5. Ensure comprehensive documentation is available, describing each plugin’s purpose, configuration options, and usage examples.

**Iteration Tasks:

• TBD

Welcome Join us
If anyone is interested in this feature or would like to participate in its development, please leave a comment in this issue to claim the task you are interested in.

Note that this feature is still under discussion, and the listed iteration tasks might be subject to change.