Implement SetUtil

[mjlescano]

Cherry pick PR for Sets implementation from #696

[codecov]

Codecov Report

Merging #746 (f7656b3) into main (47fc071) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #746      +/-   ##
==========================================
+ Coverage   94.67%   94.69%   +0.02%     
==========================================
  Files          63       64       +1     
  Lines        1070     1075       +5     
  Branches       49       54       +5     
==========================================
+ Hits         1013     1018       +5     
  Misses         57       57              

Flag	Coverage Δ
core-contracts	100.00% <100.00%> (ø)
core-js	99.14% <ø> (ø)
core-modules	100.00% <ø> (ø)
deployer	93.02% <ø> (ø)
synthetix-main	100.00% <ø> (ø)

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Impacted Files	Coverage Δ
...ackages/core-contracts/contracts/utils/SetUtil.sol	100.00% <100.00%> (ø)

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