feat: add unpauser role

[Zygimantass]

Description

Adds an UNPAUSER_ROLE which can unpause the protocol. This is done to separate the pauser role from the unpauser. The pauser role is going to have more lax requirements to be able to respond to incidents quickly, while we want the unpauser role to be more strict.

---

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• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Wrote unit and integration tests.
• Added relevant natspec and godoc comments.
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• Review SonarCloud Report in the comment section below once CI passes.

[gjermundgaraba]

Looks mostly OK to me, but would like tests added similar to the pauser tests. Also added some minor comments

[gjermundgaraba]

Why did this change?

[Zygimantass]

I wanted the workflow to test that the pauser and unpauser are two different wallets, and as such the private keys for them are different

[Zygimantass]

that's reflected in the deployments/local/31337.json file, specifically the pauser and unpauser fields.

[srdtrk]

I'm guessing that the reason why e2e tests aren't passing is because somewhere in the deployment script, ics20transfer.initialize was encoded with a abi.encodeWithSelector instead of abi.encodeCall. So it cannot validate the syntax. It is specifically here.

You may fix this now. There is a general issue for this #321, which we can address in a separate PR after this.

[srdtrk]

note that there could be multiple wallets with these roles

[Zygimantass]

yeah, I'm going to refactor this logic to take multiple addresses for both pauser and unpauser in a different PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (e929d43) to head (11cfac7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #384   +/-   ##
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  Coverage   99.86%   99.86%           
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  Files          14       14           
  Lines         731      740    +9     
=======================================
+ Hits          730      739    +9     
  Misses          1        1           

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[srdtrk]

Looks really good. I didn't notice if there is any test case where unpause succeeds. If so, you can reply to my comment and then we can merge it. Otherwise, please add it to your tests.

[srdtrk]

lgtm