Add Scala implementation

[ihostage]

Fix #16

[codecov]

Codecov Report

Merging #12 into master will increase coverage by 2.96%.
The diff coverage is 76.94%.

@@             Coverage Diff              @@
##             master      #12      +/-   ##
============================================
+ Coverage     75.72%   78.68%   +2.96%     
- Complexity       56      119      +63     
============================================
  Files             5       14       +9     
  Lines           346      319      -27     
  Branches         90       70      -20     
============================================
- Hits            262      251      -11     
+ Misses           25       20       -5     
+ Partials         59       48      -11

Impacted Files	Coverage Δ	Complexity Δ
...org/taymyr/lagom/javadsl/openapi/OpenAPIService.kt	100% <ø> (ø)	1 <0> (?)
...taymyr/lagom/scaladsl/openapi/OpenAPIService.scala	100% <100%> (ø)	2 <2> (?)
...rg/taymyr/lagom/internal/openapi/ClassLevelInfo.kt	100% <100%> (ø)	5 <5> (?)
...g/taymyr/lagom/internal/openapi/ReflectionUtils.kt	100% <100%> (ø)	6 <6> (?)
.../taymyr/lagom/internal/openapi/LagomServiceInfo.kt	100% <100%> (ø)	3 <3> (?)
...myr/lagom/internal/openapi/AnnotationExtensions.kt	50% <50%> (ø)	20 <20> (?)
.../org/taymyr/lagom/javadsl/openapi/SpecGenerator.kt	57.14% <57.14%> (ø)	10 <10> (?)
.../taymyr/lagom/scaladsl/openapi/SpecGenerator.scala	63.63% <63.63%> (ø)	9 <9> (?)
...org/taymyr/lagom/internal/openapi/LagomCallInfo.kt	80% <80%> (ø)	3 <3> (?)
...org/taymyr/lagom/internal/openapi/SpecGenerator.kt	80% <80%> (ø)	4 <4> (?)
... and 17 more

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