Changed implementation to use Kotlin compiler API

[freemanjp]

Changed to use the Kotlin compiler API (instead of Dokka) for Kotlin source parsing.

[codecov]

Codecov Report

Merging #329 (0067205) into master (d6adfce) will increase coverage by 0.20%.
The diff coverage is 90.80%.

@@             Coverage Diff              @@
##             master     #329      +/-   ##
============================================
+ Coverage     85.02%   85.23%   +0.20%     
+ Complexity       89       71      -18     
============================================
  Files             8        8              
  Lines           494      413      -81     
  Branches         82       66      -16     
============================================
- Hits            420      352      -68     
+ Misses           35       28       -7     
+ Partials         39       33       -6     

Impacted Files	Coverage Δ
...r/kotlin/internal/kotlinc/KotlinModelConversion.kt	86.53% <86.53%> (ø)
...r/kotlin/internal/kotlinc/MavenMessageCollector.kt	87.50% <87.50%> (ø)
.../plugin/extractor/kotlin/internal/SourceScanner.kt	72.22% <100.00%> (+1.29%)	⬆️
...tor/kotlin/internal/kotlinc/KotlinSourceScanner.kt	100.00% <100.00%> (ø)
...ractor/kotlin/internal/qdox/QDoxModelConversion.kt	95.23% <0.00%> (-0.60%)	⬇️
...gin/extractor/kotlin/internal/AnnotationScanner.kt	100.00% <0.00%> (ø)
.../extractor/kotlin/KotlinMojoDescriptorExtractor.kt	85.63% <0.00%> (+0.26%)	⬆️
...xtractor/kotlin/internal/qdox/QDoxSourceScanner.kt	94.59% <0.00%> (+3.16%)	⬆️

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