feat(server): migrate snake_case in prop names rule to context object to support openapi 3

[maxim-tschumak]

Related to #714

[codecov-io]

Codecov Report

Merging #815 into master will decrease coverage by 0.19%.
The diff coverage is 60%.

@@             Coverage Diff             @@
##             master     #815     +/-   ##
===========================================
- Coverage      84.7%   84.51%   -0.2%     
+ Complexity      928      923      -5     
===========================================
  Files           171      171             
  Lines          2622     2628      +6     
  Branches        395      399      +4     
===========================================
  Hits           2221     2221             
- Misses          198      199      +1     
- Partials        203      208      +5

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/de/zalando/zally/util/OpenApiUtil.kt	58.62% <54.54%> (-0.96%)	0 <0> (ø)
...ando/zally/rule/zalando/SnakeCaseInPropNameRule.kt	83.33% <75%> (-16.67%)	6 <5> (-5)

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[tkrop]

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[maxim-tschumak]

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