Adds fade in-out effects to the playback

[ashutoshgngwr]

Changes

• Added fadeIn() and fadeOut() methods to the Playback class
• Minor changes to PlaybackManager to adapt new changes in Playback

Testing

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

Others

• Fixes Add fade-in and fade-out effects for looping sounds #122
• Connects N/A

[codecov]

Codecov Report

Merging #124 into master will increase coverage by 0.34%.
The diff coverage is 92.30%.

@@             Coverage Diff              @@
##             master     #124      +/-   ##
============================================
+ Coverage     77.64%   77.99%   +0.34%     
- Complexity      102      107       +5     
============================================
  Files            11       11              
  Lines           689      709      +20     
  Branches         83       85       +2     
============================================
+ Hits            535      553      +18     
  Misses           88       88              
- Partials         66       68       +2     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/github/ashutoshgngwr/noice/sound/Playback.kt	78.75% <91.30%> (+3.75%)	23.00 <4.00> (+5.00)
...ithub/ashutoshgngwr/noice/sound/PlaybackManager.kt	75.23% <100.00%> (ø)	26.00 <0.00> (ø)

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