Add AccountMetamask

[davidyuk]

closes #2018

found issues 4-point-0/aeternity-snap#20 4-point-0/aeternity-snap#19 4-point-0/aeternity-snap#18 4-point-0/aeternity-snap#17 4-point-0/aeternity-snap#16 4-point-0/aeternity-snap#15 4-point-0/aeternity-snap#14 4-point-0/aeternity-snap#13 4-point-0/aeternity-snap#12 4-point-0/aeternity-snap#11 4-point-0/aeternity-snap#10

This PR is supported by the Æternity Foundation

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 82.62%. Comparing base (c664255) to head (0831f08).
Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/account/MetamaskFactory.ts	73.33%	11 Missing and 1 partial ⚠️
src/account/Metamask.ts	63.63%	8 Missing ⚠️
src/utils/errors.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2023      +/-   ##
===========================================
- Coverage    82.92%   82.62%   -0.30%     
===========================================
  Files          109      111       +2     
  Lines         3625     3695      +70     
  Branches       751      767      +16     
===========================================
+ Hits          3006     3053      +47     
- Misses         524      546      +22     
- Partials        95       96       +1     

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