add toml document parsing

[chris48s]

closes #405

Smol-toml requires node 18, so I'll need to drop node 16 and make the minimum node 18 to add this.

Think I'm fine with that - node 16 is EOL now, but I'll need to update the package metadata, CI matrix etc. Also this will be a major version bump as per the semver compatibility statement https://github.com/chris48s/v8r#versioning

[socket-security]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/[email protected]	None	0	71.4 kB	cyyynthia

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ebf68c6) 95.73% compared to head (7c7198f) 95.75%.
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #406      +/-   ##
==========================================
+ Coverage   95.73%   95.75%   +0.01%     
==========================================
  Files          11       11              
  Lines         797      800       +3     
  Branches      179      180       +1     
==========================================
+ Hits          763      766       +3     
  Misses         33       33              
  Partials        1        1              

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