Extend Swagger options to exclude message fields

[roman-mazur]

This allows to configure what fields should not be exposed in Swagger spec.

[codecov[bot]]

Codecov Report

Merging #27 into master will increase coverage by 0.15%. The diff coverage is 78.64%.

@@             Coverage Diff              @@
##             master      #27      +/-   ##
============================================
+ Coverage     70.83%   70.99%   +0.15%     
- Complexity     1323     1346      +23     
============================================
  Files           201      203       +2     
  Lines          5377     5430      +53     
  Branches        819      828       +9     
============================================
+ Hits           3809     3855      +46     
- Misses         1208     1214       +6     
- Partials        360      361       +1

Impacted Files	Coverage Δ	Complexity Δ
...elium/gradle/internal/SelectionRulesBuilder.groovy	0% <0%> (ø)	0 <0> (?)
...java/com/stanfy/helium/swagger/SwaggerOptions.java	100% <100%> (+8%)	8 <7> (-3)	:arrow_down:
...main/groovy/com/stanfy/helium/model/Message.groovy	76.66% <100%> (+5.83%)	18 <3> (+3)	:arrow_up:
...ler/codegen/json/schema/JsonSchemaGenerator.groovy	45% <14.28%> (ø)	2 <1> (ø)	:arrow_down:
.../com/stanfy/helium/gradle/tasks/SwaggerTask.groovy	25% <33.33%> (+25%)	1 <1> (+1)	:arrow_up:
...java/com/stanfy/helium/swagger/SwaggerHandler.java	82.46% <85.71%> (+0.11%)	34 <3> (+1)	:arrow_up:
...m/handler/codegen/json/schema/SchemaBuilder.groovy	82.66% <86.66%> (+1.5%)	31 <3> (+2)	:arrow_up:
...m/stanfy/helium/internal/utils/SelectionRules.java	93.75% <93.75%> (ø)	19 <19> (?)

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