Convert to BTreeMap right before serialization

[jameslittle230]

Fixes #261 Alternative to #265

[codecov[bot]]

Codecov Report

Merging #266 (91412a4) into master (eeaca67) will decrease coverage by 0.09%. The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master     #266      +/-   ##
==========================================
- Coverage   72.44%   72.34%   -0.10%     
==========================================
  Files          53       54       +1     
  Lines        2174     2177       +3     
  Branches      104      104              
==========================================
  Hits         1575     1575              
- Misses        598      601       +3     
  Partials        1        1              

Impacted Files	Coverage Δ
stork-lib/src/index_v3/mod.rs	70.37% <ø> (ø)
stork-lib/src/index_v3/ordered_map_serialize.rs	0.00% <0.00%> (ø)
stork-lib/src/index_v3/build/mod.rs	98.57% <100.00%> (ø)

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[github-actions[bot]]

Benchmarks

Benchmark	Baseline	Contender	Comparison
build/federalist	157.8962	188.3912	1.19×
federalist.st	1125.456	1125.456	1.0×
search/federalist/liberty	1.5719	1.7979	1.14×
stork.js	21.88	21.88	1.0×
stork.wasm	345.002	344.983	1.0×

Baseline: a7b8bdd69115b812dd9c44909139b146157f6038; Comparison: 91412a4992d0404586337b41b176c2cfe9c8ae3b

[jameslittle230]

Closing; benchmarks for this were worse than benchmarks for #265