refactor: use regexp-tree instead of operations with strings

[dangreen]

more optimizations were added, "defaults" query with allowHigherVersions is now ~30% smaller than in v3

[github-actions]

size-limit report 📦

Path	Size
dist/index.js	7.77 KB (+9.73% 🔺)
dist/cli.js	1.4 KB (+4.45% 🔺)

[codecov-commenter]

Codecov Report

Base: 99.68% // Head: 97.76% // Decreases project coverage by -1.91% ⚠️

Coverage data is based on head (de28083) compared to base (b574439).
Patch coverage: 96.87% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1462      +/-   ##
==========================================
- Coverage   99.68%   97.76%   -1.92%     
==========================================
  Files          24       28       +4     
  Lines        1568     1926     +358     
  Branches      268      298      +30     
==========================================
+ Hits         1563     1883     +320     
- Misses          4       43      +39     
+ Partials        1        0       -1     

Impacted Files	Coverage Δ
src/semver/index.ts	100.00% <ø> (ø)
src/useragentRegex/utils.ts	71.73% <71.73%> (ø)
src/useragentRegex/useragentRegex.ts	91.17% <84.00%> (-5.60%)	⬇️
src/regex/utils.ts	84.61% <84.12%> (-15.39%)	⬇️
src/regex/regex.ts	96.39% <96.39%> (ø)
src/regex/nodes.ts	97.68% <97.68%> (ø)
src/regex/optimize.ts	99.23% <99.11%> (-0.77%)	⬇️
src/versions/utils.ts	99.12% <99.12%> (ø)
src/browsers/browserslist.ts	100.00% <100.00%> (ø)
src/browsers/optimize.ts	99.18% <100.00%> (-0.11%)	⬇️
... and 16 more

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