Schema validator

[fedefernandez]

Fixes #49

[codecov-io]

Codecov Report

Merging #50 into master will decrease coverage by 1.3%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
- Coverage   88.92%   87.62%   -1.31%     
==========================================
  Files          15       15              
  Lines         325      307      -18     
==========================================
- Hits          289      269      -20     
- Misses         36       38       +2

Impacted Files	Coverage Δ
...n/scala/schema/validator/TroySchemaValidator.scala	100% <100%> (ø)
core/src/main/scala/schema/package.scala	100% <100%> (ø)
core/src/main/scala/schema/validator/package.scala	100% <100%> (ø)
...ain/scala/schema/provider/TroySchemaProvider.scala	83.33% <83.33%> (ø)
core/src/main/scala/config/model.scala	100% <0%> (+6.25%)	⬆️

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[raulraja]

Having a schema validation API for runtime verification based on Validated is awesome but we also need validation to happen in string interpolation at compile time.

[fedefernandez]

Sure, I'll finish the story with #51 and then I'll continue with the interpolator (#45 & #19)