fix: improve security by adding Object.freeze to global objects and l…

[vitoke]

…ocal singletons

Fixes #72

[codecov-commenter]

Codecov Report

Merging #73 (426277d) into main (1eeeaf0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files          56       56           
  Lines        4439     4439           
  Branches      458      456    -2     
=======================================
  Hits         3783     3783           
  Misses        568      568           
  Partials       88       88           

Impacted Files	Coverage Δ
packages/common/src/reducer.ts	17.62% <ø> (ø)
packages/common/src/traverse-state.ts	100.00% <100.00%> (ø)

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