Refactor schema and constraints

[wyfo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #350 (00e6d4f) into master (c37988b) will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #350      +/-   ##
==========================================
+ Coverage   86.20%   86.22%   +0.01%     
==========================================
  Files          67       66       -1     
  Lines        5878     5864      -14     
  Branches     1221     1218       -3     
==========================================
- Hits         5067     5056      -11     
+ Misses        593      591       -2     
+ Partials      218      217       -1     

Impacted Files	Coverage Δ
apischema/constraints.py	88.70% <ø> (ø)
apischema/graphql/schema.py	87.05% <0.00%> (+0.18%)	⬆️
apischema/schemas.py	77.92% <76.00%> (ø)
apischema/deserialization/__init__.py	99.65% <100.00%> (ø)

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