Improve code climate/maintainability

[bravo-kernel]

Introduces lib/utils/type-checks.js to refactor type checking.

[codecov]

Codecov Report

Merging #41 into master will increase coverage by 4.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage    76.3%   80.42%   +4.12%     
==========================================
  Files           7        8       +1     
  Lines         325      327       +2     
==========================================
+ Hits          248      263      +15     
+ Misses         77       64      -13

Impacted Files	Coverage Δ
lib/schema-manager.js	92.12% <100%> (+6.81%)	⬆️
lib/utils/type-checks.js	100% <100%> (ø)

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