Enable decimal comma

[jakeboone02]

Adds support for European-style decimal comma with the decimalSeparator: '.' | ',' option.

Bumps minimum JavaScript version to ES2021 (now uses String.prototype.replaceAll).

Coming later: decimalSeparator: 'auto' to auto-detect decimal point versus decimal comma.

[codesandbox-ci]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7544db6) to head (68b2c25).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main       #37    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            4         3     -1     
  Lines          474       232   -242     
==========================================
- Hits           474       232   -242     

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