coll: CSEL redesign

[hzhou]

Pull Request Description

WIP

[skip warnings]

Discussion

Reference: https://github.com/pmodels/mpich/discussions/7544

Author Checklist

• [ ] Provide Description Particularly focus on why, not what. Reference background, issues, test failures, xfail entries, etc.
• [ ] Commits Follow Good Practice Commits are self-contained and do not do two things at once. Commit message is of the form: module: short description Commit message explains what's in the commit.
• [ ] Passes All Tests Whitespace checker. Warnings test. Additional tests via comments.
• [ ] Contribution Agreement For non-Argonne authors, check contribution agreement. If necessary, request an explicit comment from your companies PR approval manager.

[hzhou]

test:mpich/custom netmod: ch4:ofi