fix(node): throw clear error message if unsupported protocol

[davidyuk]

closes #1878

This PR is supported by the Æternity Crypto Foundation

[codecov]

Codecov Report

Patch coverage: 83.33% and project coverage change: +0.04% 🎉

Comparison is base (dec62a4) 81.37% compared to head (21dfe34) 81.42%.
Report is 14 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1898      +/-   ##
===========================================
+ Coverage    81.37%   81.42%   +0.04%     
===========================================
  Files           94       94              
  Lines         3361     3370       +9     
  Branches       671      672       +1     
===========================================
+ Hits          2735     2744       +9     
  Misses         303      303              
  Partials       323      323              

Files Changed	Coverage Δ
src/tx/builder/field-types/fee.ts	95.55% <0.00%> (ø)
src/tx/builder/field-types/gas-price.ts	77.77% <0.00%> (ø)
src/utils/crypto.ts	95.74% <ø> (ø)
src/Node.ts	92.98% <100.00%> (+1.31%)	⬆️
src/contract/Contract.ts	75.28% <100.00%> (ø)
src/utils/autorest.ts	90.66% <100.00%> (ø)

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