add function for plurality tally

[b-pmcg]

No description provided.

[codecov]

Codecov Report

Merging #294 (e027a43) into dev (24a83be) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #294      +/-   ##
==========================================
+ Coverage   83.09%   83.16%   +0.06%     
==========================================
  Files         134      134              
  Lines        5419     5441      +22     
  Branches     1105     1111       +6     
==========================================
+ Hits         4503     4525      +22     
  Misses        916      916              

Impacted Files	Coverage Δ
...ges/dai-plugin-governance/src/GovPollingService.js	82.07% <100.00%> (+2.07%)	⬆️

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