Add platform suffix to files with same name across platforms

[vlovgr]

Codecov currently has an issue where code coverage doesn't work if you have multiple files with the exact same name in the project. This is an attempt to address that issue by including a platform suffix for files sharing the same name across platforms.

[codecov]

Codecov Report

Merging #148 into master will increase coverage by 4.59%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
+ Coverage   95.11%   99.71%   +4.59%     
==========================================
  Files          43       43              
  Lines         696      696              
  Branches        5        5              
==========================================
+ Hits          662      694      +32     
+ Misses         34        2      -32

Impacted Files	Coverage Δ
...ciris/refined/decoders/RefinedConfigDecoders.scala	100% <0%> (+100%)	⬆️
...n/scala/ciris/decoders/JavaNetConfigDecoders.scala	100% <0%> (+100%)	⬆️
...ined/jvm/src/main/scala/ciris/refined/syntax.scala	100% <0%> (+100%)	⬆️
...ala/ciris/decoders/JavaNioFileConfigDecoders.scala	100% <0%> (+100%)	⬆️
...in/scala/ciris/ConfigKeyTypePlatformSpecific.scala	100% <0%> (+100%)	⬆️
...ain/scala/ciris/ConfigSourcePlatformSpecific.scala	100% <0%> (+100%)	⬆️
...m/src/main/scala/ciris/CirisPlatformSpecific.scala	100% <0%> (+100%)	⬆️
...in/scala/ciris/decoders/JavaIoConfigDecoders.scala	100% <0%> (+100%)	⬆️

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