Introduced tsconfig.app.json and tsconfig.base.json + Refactored eslint.config.js to the latest structure

[yuri-sakharov]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 18.67%. Comparing base (65a250e) to head (bfabc4d).
⚠️ Report is 9 commits behind head on main.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #652   +/-   ##
=======================================
  Coverage   18.67%   18.67%           
=======================================
  Files          14       14           
  Lines        2115     2115           
=======================================
  Hits          395      395           
  Misses       1677     1677           
  Partials       43       43           

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