fix: allow root to propose and remove fees

[wischli]

Description

Fixes #1847

Changes and Descriptions

• Feat: Allow root origin for proposing fees
• Fix: Allow root origin for removing fees if fee editor is configured as Root

Checklist:

• I have added Rust doc comments to structs, enums, traits and functions
• I have made corresponding changes to the documentation
• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works

[lemunozm]

Simple and clean!

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 46.50%. Comparing base (c6dea28) to head (30590d1).

Files	Patch %	Lines
pallets/pool-fees/src/lib.rs	40.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1855      +/-   ##
==========================================
- Coverage   46.54%   46.50%   -0.04%     
==========================================
  Files         167      167              
  Lines       13101    13105       +4     
==========================================
- Hits         6098     6095       -3     
- Misses       7003     7010       +7     

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