[Do not merge] Blockstack.js async crypto

[zone117x]

This PR is currently only for the purpose of testing a feature branch of blockstack.js for using the W3C cryptographic operations: https://github.com/blockstack/blockstack.js/issues/691. These are async-only and require a breaking change in blockstack.js.

This repo (gaia) is being used for testing the blockstack.js API surface changes and the Node.js runtime behaviors.

Will move this PR out of draft if/when the blockstack.js changes are solidified and merged.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d526a70) 81.01% compared to head (731e5a6) 81.03%. Report is 81 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #272      +/-   ##
===========================================
+ Coverage    81.01%   81.03%   +0.01%     
===========================================
  Files           21       21              
  Lines         1591     1592       +1     
  Branches       277      277              
===========================================
+ Hits          1289     1290       +1     
  Misses         226      226              
  Partials        76       76              

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[CLAassistant]

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