MEX-351: governance contract shard field

[dragos-rebegea]

Reasoning

• frontend needs the SC shard in order to compute timers based on block numbers

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b0f0160) 56.56% compared to head (be84fad) 56.56%.

Additional details and impacted files

@@             Coverage Diff              @@
##           development    #1138   +/-   ##
============================================
  Coverage        56.56%   56.56%           
============================================
  Files              234      234           
  Lines             7800     7800           
  Branches           520      520           
============================================
  Hits              4412     4412           
  Misses            2945     2945           
  Partials           443      443           

Flag	Coverage Δ
unittests	56.56% <ø> (ø)

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