[Polymorphism Prep] Expose private KotlinGenerator methods in SharedCodegen

[macisamuele]

This PR does some preparatory work for #103 . In order to achieve polymorphism support we need to extract few functionalities from KotlinGenerator to SharedCodegen.

I totally understand that this PR seems disconnected and doesn't really explain why certain features are moved back to SharedCodegen or why we do even need to iterate over all CodegenModel.*vars. In order to provide a better visibility I would suggest to check the potential draft of polymorphism on macisamuele/swagger-gradle-codegen@maci-polymmorphism

[macisamuele]

I've rebased this branch on top of the laster master to remove the merge conflicts.

@cortinico could you please have a look to this CR?

This provides a starting point for for #103 and by itself does not provide any change that deserve a major release, so it could be merged even if we're not yet planning on having the 2.0.0 release

[macisamuele]

@cortinico it will take me some time (maybe a few weeks) to provide changes on this PR. Currently my laptop is not powerful enough to run all the tasks ;)

Maybe having also the second part will help understand some of the changes

The current branch that fully targets #103 is avaiblable on https://github.com/macisamuele/swagger-gradle-codegen/tree/maci-polymorphism .

[cortinico]

@cortinico it will take me some time (maybe a few weeks) to provide changes on this PR. Currently my laptop is not powerful enough to run all the tasks ;)

No problem, let's keep this opened for now.

[codecov[bot]]

Codecov Report

Merging #104 (249f4d2) into master (5318347) will increase coverage by 1.81%. The diff coverage is 82.92%.

:exclamation: Current head 249f4d2 differs from pull request most recent head cdd09a3. Consider uploading reports for the commit cdd09a3 to get more accurate results

@@             Coverage Diff              @@
##             master     #104      +/-   ##
============================================
+ Coverage     70.83%   72.65%   +1.81%     
- Complexity      138      147       +9     
============================================
  Files            11       12       +1     
  Lines           576      607      +31     
  Branches         87       80       -7     
============================================
+ Hits            408      441      +33     
- Misses          118      122       +4     
+ Partials         50       44       -6     

Impacted Files	Coverage Δ
.../src/main/java/com/yelp/codegen/KotlinGenerator.kt	83.62% <ø> (+0.83%)	:arrow_up:
...in/src/main/java/com/yelp/codegen/SharedCodegen.kt	63.93% <77.41%> (+6.14%)	:arrow_up:
...ain/java/com/yelp/codegen/utils/CodegenModelVar.kt	100.00% <100.00%> (ø)
...ugin/plugin/src/main/java/com/yelp/codegen/Main.kt	98.33% <0.00%> (-0.06%)	:arrow_down:
...rc/main/java/com/yelp/codegen/utils/StringUtils.kt	100.00% <0.00%> (+11.11%)	:arrow_up:

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