Enable TypeProcessors for thrifty-gradle-plugin

[benjamin-bader]

Closes #489

[codecov-commenter]

Codecov Report

Merging #490 (eb3f656) into master (5c047e5) will decrease coverage by 1.12%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #490      +/-   ##
============================================
- Coverage     59.18%   58.06%   -1.13%     
+ Complexity      868      811      -57     
============================================
  Files            69       69              
  Lines          6488     6226     -262     
  Branches       1012      970      -42     
============================================
- Hits           3840     3615     -225     
+ Misses         2346     2332      -14     
+ Partials        302      279      -23     

Impacted Files	Coverage Δ
...hrifty/gradle/GenerateThriftSourcesWorkAction.java	0.00% <0.00%> (ø)
.../microsoft/thrifty/gradle/ThriftyGradlePlugin.java	8.69% <0.00%> (-0.20%)	⬇️
.../com/microsoft/thrifty/kgen/KotlinCodeGenerator.kt	85.22% <0.00%> (+0.41%)	⬆️

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