Change OpenAPI.getAllParameters() helper function

[vadeg]

• Change return type in OpenAPI.getAllParameters() from Map<String, Parameter> to Collection<Parameter>
• Update dependent rules

Fixes #1317

[codecov-commenter]

Codecov Report

Merging #1333 (e1cd02d) into master (f00c85c) will decrease coverage by 0.03%.
The diff coverage is 63.63%.

@@             Coverage Diff              @@
##             master    #1333      +/-   ##
============================================
- Coverage     75.05%   75.01%   -0.04%     
+ Complexity      932      931       -1     
============================================
  Files           167      167              
  Lines          2682     2682              
  Branches        492      492              
============================================
- Hits           2013     2012       -1     
  Misses          410      410              
- Partials        259      260       +1     

Impacted Files	Coverage Δ
.../main/kotlin/org/zalando/zally/core/CaseChecker.kt	28.67% <0.00%> (ø)
.../kotlin/org/zalando/zally/core/util/OpenApiUtil.kt	49.41% <25.00%> (-1.18%)	⬇️
...eset/zalando/QueryParameterCollectionFormatRule.kt	77.77% <100.00%> (ø)
...g/zalando/zally/ruleset/zally/PathParameterRule.kt	75.00% <100.00%> (ø)

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[vadeg]

👍

[tkrop]

👍

[tkrop]

Strange that the coverage is shrinking while this should be a none-change.