Convert Filters to Registrar

It does say it is deprecated here: https://codeigniter4.github.io/CodeIgnit...ml#filters

It is the documentation for how to register filter aliases from a module (or Composer package).
For example, Shield registers some filter aliases:
https://github.com/codeigniter4/shield/b...hp#L33-L48

Do you want to try to do something like that?

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