Ethereum websocket module

[borjantrajanoski]

Related to #97

[codecov-io]

Codecov Report

Merging #102 into develop will increase coverage by 0.46%.
The diff coverage is 74.72%.

@@             Coverage Diff             @@
##           develop     #102      +/-   ##
===========================================
+ Coverage    55.29%   55.75%   +0.46%     
===========================================
  Files           69       70       +1     
  Lines         4174     4265      +91     
===========================================
+ Hits          2308     2378      +70     
- Misses        1433     1449      +16     
- Partials       433      438       +5

Impacted Files	Coverage Δ
dapp/registry/registry.go	41.73% <100%> (+1.89%)	⬆️
ethws/ws.go	73.56% <73.56%> (ø)
backend/ws_transport.go	69.23% <0%> (+1.7%)	⬆️

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