fix(crypto): disable multisig

[spkjp]

Proposed changes

To be superseded by AIP18.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improve a current implementation without adding a new feature or fixing a bug)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Build (changes that affect the build system)
• Docs (documentation only changes)
• Test (adding missing tests or fixing existing tests)
• Other... Please describe:

Checklist

• I have read the CONTRIBUTING documentation
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[ghost]

@faustbrian @air1one - please review this in the next few days. Be sure to explicitly select labels so I know what's going on.

If no reviewer appears after a week, a reminder will be sent out.

[codecov-io]

Codecov Report

Merging #2057 into develop will decrease coverage by 0.04%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##           develop    #2057      +/-   ##
===========================================
- Coverage    73.81%   73.76%   -0.05%     
===========================================
  Files          367      367              
  Lines         8259     8257       -2     
  Branches      1177     1176       -1     
===========================================
- Hits          6096     6091       -5     
- Misses        2131     2134       +3     
  Partials        32       32

Impacted Files	Coverage Δ
...ckages/crypto/src/handlers/transactions/handler.ts	97.56% <0%> (-2.44%)	⬇️
packages/crypto/src/models/transaction.ts	100% <100%> (ø)	⬆️
...rypto/src/handlers/transactions/multi-signature.ts	90% <0%> (-10%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8a3a45b...7d24137. Read the comment docs.

[n4ru]

Why? The ACF has plans to use multisig and there's no clear timeline for the addition of the new implemention. This would severely impede plans to remove dedicated escrow.