#20 Change Map to thread-safe implementation

[IlyaLisov]

close #20

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PR-Codex overview

This PR focuses on making the TokenStorageImpl class thread-safe by replacing the HashMap with a ConcurrentHashMap.

Detailed summary

• Replaced the HashMap with a ConcurrentHashMap in the TokenStorageImpl class to ensure thread-safety.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (190c55e) 88.07% compared to head (3585b39) 88.07%.

Additional details and impacted files

@@            Coverage Diff            @@
##                dev      #25   +/-   ##
=========================================
  Coverage     88.07%   88.07%           
  Complexity       42       42           
=========================================
  Files             6        6           
  Lines           218      218           
  Branches          8        8           
=========================================
  Hits            192      192           
  Misses           21       21           
  Partials          5        5           

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