Fixes volume serialization/deserialization to/from JSON in Playback

[ashutoshgngwr]

This was breaking compatibility after 0.3.0. Older versions used a Float data type for volumes while newer versions started using Int. This was an oversight and hence the fix.

Changes

Add a custom Serializer and Deserializer for volume field in playback

Testing

• Tested on a physical device
• Added or modified unit test cases

Others

• Fixes #0
• Connects #0

[codecov]

Codecov Report

Merging #105 into master will decrease coverage by 0.34%.
The diff coverage is 37.50%.

@@             Coverage Diff              @@
##             master     #105      +/-   ##
============================================
- Coverage     77.72%   77.38%   -0.35%     
  Complexity      102      102              
============================================
  Files            11       11              
  Lines           669      681      +12     
  Branches         81       83       +2     
============================================
+ Hits            520      527       +7     
- Misses           85       88       +3     
- Partials         64       66       +2     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/github/ashutoshgngwr/noice/sound/Playback.kt	75.00% <37.50%> (-5.77%)	18.00 <0.00> (ø)
...hutoshgngwr/noice/fragment/SoundLibraryFragment.kt	80.72% <0.00%> (+0.23%)	8.00% <0.00%> (ø%)
...ithub/ashutoshgngwr/noice/sound/PlaybackManager.kt	75.23% <0.00%> (+0.23%)	26.00% <0.00%> (ø%)
...hub/ashutoshgngwr/noice/fragment/PresetFragment.kt	88.42% <0.00%> (+0.24%)	5.00% <0.00%> (ø%)

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