chore: make fee aggregation permissionless

[kerber0x]

Description and Motivation

This PR makes the fee aggregation permissionless on the fee collector contract.

Related Issues

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Checklist:

• I have read Migaloo's contribution guidelines.
• My pull request has a sound title and description (not something vague like Update index.md)
• All existing and new tests are passing.
• I updated/added relevant documentation.
• The code is formatted properly cargo fmt --all --.
• Clippy doesn't report any issues cargo clippy -- -D warnings.
• I have regenerated the schemas if needed cargo schema.

[0xFable]

LGTM, 1 question but overall looks good.

[kerber0x]

Will be fixing tests soon.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b64cc7e) 94.48% compared to head (66793ef) 94.51%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #226      +/-   ##
==========================================
+ Coverage   94.48%   94.51%   +0.02%     
==========================================
  Files         218      218              
  Lines       24659    24720      +61     
==========================================
+ Hits        23299    23364      +65     
+ Misses       1360     1356       -4     

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