feat(cli): Add --unsafe-mode argument to run_node

[msbrogli]

--unsafe-mode with no unsafe argument

--test-mode-tx-weight with --unsafe-mode

Error using --test-mode-tx-weight without --unsafe-mode

[codecov]

Codecov Report

Merging #278 (d064f49) into dev (a6d9933) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #278   +/-   ##
=======================================
  Coverage   82.42%   82.42%           
=======================================
  Files         149      149           
  Lines       14116    14116           
  Branches     2014     2014           
=======================================
  Hits        11635    11635           
  Misses       2065     2065           
  Partials      416      416           

Impacted Files	Coverage Δ
hathor/p2p/node_sync.py	83.04% <0.00%> (-0.50%)	⬇️
hathor/consensus.py	93.48% <0.00%> (+0.38%)	⬆️

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