feat: enable multiple pausers and unpausers

[Zygimantass]

Description

This PR enables the ICS20Transfer contracts to initialize with multiple pausers and unpausers.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (a769748) to head (e376bcc).

Additional details and impacted files

@@                   Coverage Diff                   @@
##           zygis/admin-only-pause     #388   +/-   ##
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  Coverage                   99.86%   99.86%           
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  Files                          14       14           
  Lines                         740      740           
=======================================================
  Hits                          739      739           
  Misses                          1        1           

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[gjermundgaraba]

Actually, we don't want to have all this complex initialization stuff. Rather the deployment procedure should be that we set it up with a simple wallet and then give all the permissions as separate actions (including the deployer to set set the correct admin). This can all still be done in a script though.

In fact, if anything we would probably want to remove more from the initializer function to make it simpler.