[WIP] JSON schema

[luizirber]

@jiarong asked for this about a month ago and I forgot to open a PR.

Create JSON schemas for minhash and SBTs

TODO

• clean them up
• add the validation logic (using jsonschema)
  • check https://www.peterbe.com/plog/jsonschema-validate-10x-faster-in-python

Checklist

• Is it mergeable?
• make test Did it pass the tests?
• make coverage Is the new code covered?
• Did it change the command-line interface? Only additions are allowed
  without a major version increment. Changing file formats also requires a
  major version number increment.
• Was a spellchecker run on the source code and documentation after
  changes were made?

[codecov]

Codecov Report

Merging #578 into master will increase coverage by 4.54%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #578      +/-   ##
==========================================
+ Coverage   83.89%   88.43%   +4.54%     
==========================================
  Files          98       31      -67     
  Lines        9126     4790    -4336     
  Branches        0       46      +46     
==========================================
- Hits         7656     4236    -3420     
+ Misses       1470      551     -919     
- Partials        0        3       +3     

Flag	Coverage Δ
#rusttests	?

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Impacted Files	Coverage Δ
sourmash/schema/__init__.py	100.00% <100.00%> (ø)
sourmash/command_compute.py	76.30% <0.00%> (-21.34%)	⬇️
sourmash/compare.py	89.55% <0.00%> (-10.45%)	⬇️
sourmash/lca/command_summarize.py	82.79% <0.00%> (-7.21%)	⬇️
sourmash/sbt_storage.py	85.39% <0.00%> (-6.73%)	⬇️
sourmash/sbtmh.py	85.00% <0.00%> (-4.91%)	⬇️
sourmash/sbt.py	85.53% <0.00%> (-3.33%)	⬇️
sourmash/lca/command_classify.py	86.36% <0.00%> (-2.53%)	⬇️
sourmash/lca/command_index.py	90.70% <0.00%> (-2.53%)	⬇️
sourmash/fig.py	88.88% <0.00%> (-0.25%)	⬇️
... and 92 more

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[luizirber]

also see: https://github.com/wolverdude/GenSON

[luizirber]

see also: https://github.com/GREsau/schemars