remove SmallVec and LazyIndexMap from json value

[davidhewitt]

Possible alternative to #131.

Pushing to the pipeline to get feedback, locally this seems very similar on perf.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 44 lines in your changes missing coverage. Please review.

Project coverage is 46.15%. Comparing base (4cefa8b) to head (7cff228).

Files with missing lines	Patch %	Lines
crates/jiter/src/value.rs	0.00%	44 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (4cefa8b) and HEAD (7cff228). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (4cefa8b)	HEAD (7cff228)
	7	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #184       +/-   ##
===========================================
- Coverage   88.71%   46.15%   -42.57%     
===========================================
  Files          13       12        -1     
  Lines        2207     2004      -203     
  Branches     2207     2004      -203     
===========================================
- Hits         1958      925     -1033     
- Misses        153     1037      +884     
+ Partials       96       42       -54     

Files with missing lines	Coverage Δ
crates/jiter/src/value.rs	0.00% <0.00%> (-81.11%)	⬇️

... and 12 files with indirect coverage changes

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[codspeed-hq]

CodSpeed Performance Report

Merging #184 will not alter performance

_{Comparing dh/simpler-value (7cff228) with main (4cefa8b)}

Summary

✅ 73 untouched benchmarks