Support refined types

[cchantep]

New frameless-refined module

Closes #257

[codecov]

Codecov Report

Merging #571 (007c323) into master (f25a99c) will decrease coverage by 0.41%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master     #571      +/-   ##
==========================================
- Coverage   95.54%   95.13%   -0.42%     
==========================================
  Files          63       65       +2     
  Lines        1101     1131      +30     
  Branches        8       11       +3     
==========================================
+ Hits         1052     1076      +24     
- Misses         49       55       +6     

Flag	Coverage Δ
2.12.15	95.13% <81.25%> (-0.42%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ataset/src/main/scala/frameless/TypedEncoder.scala	97.12% <50.00%> (-0.46%)	⬇️
...ned/src/main/scala/frameless/refined/package.scala	66.66% <66.66%> (ø)
...taset/src/main/scala/frameless/RecordEncoder.scala	92.59% <80.00%> (-1.00%)	⬇️
...scala/frameless/refined/RefinedFieldEncoders.scala	89.47% <89.47%> (ø)

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[cchantep]

Rebased

[pomadchin]

🚀 That is awesome! Thanks! Checked it in my project where refined types worked inside Option monads, no regressions noticed.

I left as usual a couple of build / codestyle comments; but they are not critical.