Preserve struct ordering when pretty-printing

[FedorChervyakov]

Fixes #192.

In this PR we rewrite the pretty function to parse the input as a JSON3.Object and add a couple of tests for the pretty function.

By parsing the input string as JSON3.Object and passing it recursively to pretty, we preserve field ordering.

New tests check that ordering of nested structs and NamedTuples is preserved. Also, this PR wraps tests related to pretty in pretty.jl testset.

[quinnj]

This looks to be headed in a decent direction. It does make me wonder though if we should just take a different approach all together w/ pretty printing and parse the input as a JSON3.Object first and then recursively print it out in a pretty way. That would preserve the ordering and probably end up being a simple implementation. But it's been long enough since I wrote this that I may have already tried that and it didn't work for some other reason.

[FedorChervyakov]

This looks to be headed in a decent direction. It does make me wonder though if we should just take a different approach all together w/ pretty printing and parse the input as a JSON3.Object first and then recursively print it out in a pretty way. That would preserve the ordering and probably end up being a simple implementation. But it's been long enough since I wrote this that I may have already tried that and it didn't work for some other reason.

Cool, it does make sense to parse as JSON3.Object first, I'll try to rewrite pretty using this approach.

[codecov[bot]]

Codecov Report

Merging #195 (06040bd) into main (da3ca85) will decrease coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #195      +/-   ##
==========================================
- Coverage   88.83%   88.78%   -0.05%     
==========================================
  Files           9        9              
  Lines        1693     1650      -43     
==========================================
- Hits         1504     1465      -39     
+ Misses        189      185       -4     

Impacted Files	Coverage Δ
src/pretty.jl	91.83% <100.00%> (+0.53%)	:arrow_up:

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