feat: JSON: refactor IO for JSON; make input implementations column optimizable

[douglasdavis]

More JSON development to enable schema <--> layout/form round trips (motivated by column projection optimizations)

[codecov-commenter]

Codecov Report

Merging #94 (a9c6031) into main (3d7d2c5) will decrease coverage by 1.50%.
The diff coverage is 79.22%.

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@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   94.92%   93.43%   -1.50%     
==========================================
  Files          23       23              
  Lines        2780     2923     +143     
==========================================
+ Hits         2639     2731      +92     
- Misses        141      192      +51     

Files Changed	Coverage Δ
src/dask_awkward/lib/_utils.py	88.23% <33.33%> (-11.77%)	⬇️
src/dask_awkward/lib/io/io.py	95.93% <50.00%> (+0.01%)	⬆️
src/dask_awkward/lib/io/parquet.py	92.39% <71.42%> (-0.90%)	⬇️
src/dask_awkward/lib/io/json.py	83.51% <79.71%> (-15.80%)	⬇️
src/dask_awkward/__init__.py	100.00% <100.00%> (ø)
src/dask_awkward/lib/core.py	92.60% <100.00%> (-0.08%)	⬇️
src/dask_awkward/lib/testutils.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[martindurant]

Ah, this is where the code we were talking about lives. We should be in a position to enable this with the new optimization?

[douglasdavis]

Yep! Once #141 is in this should fall into place without too much difficulty (knock on wood)