Remove the Kotlin support (moved to reactor-kotlin)

[bsideup]

The build will fail due to the compatibility check

[simonbasle]

@bsideup the build japicmp task has an classExclude configuration option that can take a String[] of fully-qualified class names to exclude from the comparison. not sure how valid that option is for kotlin code though, since the extensions are not classes... maybe building locally and looking at the full japicmp report will help?

[bsideup]

@simonbasle good idea! Done

[codecov-io]

Codecov Report

Merging #1691 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1691      +/-   ##
============================================
+ Coverage     84.35%   84.39%   +0.03%     
+ Complexity     3931     3930       -1     
============================================
  Files           362      357       -5     
  Lines         30048    29995      -53     
  Branches       5590     5589       -1     
============================================
- Hits          25346    25313      -33     
+ Misses         3085     3073      -12     
+ Partials       1617     1609       -8

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/reactor/core/publisher/MonoNext.java	80% <0%> (-7.5%)	2% <0%> (ø)
...va/reactor/core/publisher/MonoCompletionStage.java	86.66% <0%> (-6.67%)	10% <0%> (-1%)
.../main/java/reactor/core/publisher/FluxFlatMap.java	94.4% <0%> (-0.39%)	13% <0%> (ø)
...ain/java/reactor/core/publisher/FluxConcatMap.java	90.14% <0%> (-0.29%)	7% <0%> (ø)
...rc/main/java/reactor/core/publisher/Operators.java	80.56% <0%> (+0.14%)	125% <0%> (ø)	⬇️
...c/main/java/reactor/core/publisher/FluxReplay.java	84.31% <0%> (+0.15%)	25% <0%> (ø)	⬇️
...c/main/java/reactor/core/publisher/FluxExpand.java	95.06% <0%> (+0.44%)	3% <0%> (ø)	⬇️
...eactor/core/publisher/ParallelMergeSequential.java	80.31% <0%> (+0.51%)	7% <0%> (ø)	⬇️
...ava/reactor/core/publisher/EventLoopProcessor.java	80.82% <0%> (+0.51%)	53% <0%> (+1%)	⬆️
...in/java/reactor/core/publisher/TopicProcessor.java	74.85% <0%> (+0.59%)	16% <0%> (ø)	⬇️
... and 6 more

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