Added BlockGuard

[dovgopoly]

• Since this PR suggests a bug fix, the tests have been added and the coverage is 100%.
• Since this PR introduces a new feature, the update has been discussed in an Issue or with the team.
• This PR is just a minor change, like a typo fix.

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (557642b) 100.00% compared to head (92c8341) 100.00%.
Report is 4 commits behind head on master.

❗ Current head 92c8341 differs from pull request most recent head 202a5e1. Consider uploading reports for the commit 202a5e1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #63   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           34        35    +1     
  Lines         1264      1280   +16     
  Branches       155       156    +1     
=========================================
+ Hits          1264      1280   +16     

Files	Coverage Δ
contracts/libs/arrays/ArrayHelper.sol	100.00% <100.00%> (ø)
contracts/libs/decimals/DecimalsConverter.sol	100.00% <100.00%> (ø)
contracts/utils/BlockGuard.sol	100.00% <100.00%> (ø)

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[Arvolear]

Cool