Wire with PyGrid report

[vvmnnnkv]

PR changes:

• update to new websocket response format in pygrid
• Model params serialization fixed to work with pygrid
• GPU mem leaks addressed

Example is tested with FL hosted from experimental notebooks: OpenMined/PySyft#3224
and with pygrid branch OpenMined/PyGrid-deprecated---see-PySyft-#518
and shows multiple cycles of training and model params averaging!

[codecov]

Codecov Report

Merging #110 into master will increase coverage by 0.4%.
The diff coverage is 50%.

@@            Coverage Diff            @@
##           master     #110     +/-   ##
=========================================
+ Coverage   71.27%   71.67%   +0.4%     
=========================================
  Files          21       22      +1     
  Lines         724      752     +28     
  Branches       96       98      +2     
=========================================
+ Hits          516      539     +23     
- Misses        184      188      +4     
- Partials       24       25      +1

Impacted Files	Coverage Δ
src/_helpers.js	95.45% <ø> (ø)	⬆️
src/syft-model.js	0% <0%> (ø)
src/job.js	0% <0%> (ø)	⬆️
src/types/torch.js	94.28% <100%> (+0.73%)	⬆️
src/syft.js	15.09% <100%> (ø)	⬆️
src/grid-api-client.js	14.44% <40%> (+1.65%)	⬆️
src/types/message.js	83.6% <50%> (ø)	⬆️
src/types/plan.js	92.3% <91.66%> (+0.64%)	⬆️
src/object-registry.js	92.85% <92.85%> (ø)

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