feat: remove sign-addon

[willdurand]

Fixes #2737

[fregante]

dat lockfile diff 🥵

[rpl]

@willdurand I looked into the functional test failure and while I was there I thought to also rebase this PR to resolve the conflicts it got in the meantime, I'm about to push an update to this existing PR and branch to confirm that the functional tests will be passing when running as part of the CI job as they did when I was executing them locally (and that I didn't missed any other tests failing while we remove the sign-addon dependency).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dd8c082) 99.48% compared to head (b2cf0d5) 99.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2880      +/-   ##
==========================================
- Coverage   99.48%   99.31%   -0.18%     
==========================================
  Files          32       32              
  Lines        1761     1753       -8     
==========================================
- Hits         1752     1741      -11     
- Misses          9       12       +3     

Files	Coverage Δ
src/cmd/sign.js	94.73% <100.00%> (-5.27%)	⬇️
src/program.js	98.58% <ø> (ø)

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[willdurand]

Excellent, thanks!