Add keepContextAvailable parameter

[bilal-alsharifi]

Fixes #624

This PR is ready for review.

Risk

This PR makes minor API changes.

Testing Plan

• Updated the current unit tests and added the new param

Summary

This PR adds the missing keepContextAvailable param to AudioControlCapabilities as described in this proposal revisions.

CLA

• I have signed the CLA

[codecov-io]

Codecov Report

Merging #887 into develop will increase coverage by 0.03%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop     #887      +/-   ##
=============================================
+ Coverage      42.42%   42.45%   +0.03%     
- Complexity      3704     3706       +2     
=============================================
  Files            433      433              
  Lines          22942    22949       +7     
  Branches        2660     2661       +1     
=============================================
+ Hits            9733     9744      +11     
+ Misses         12578    12572       -6     
- Partials         631      633       +2

Impacted Files	Coverage Δ	Complexity Δ
...om/smartdevicelink/proxy/rpc/AudioControlData.java	100% <ø> (ø)	10 <0> (ø)	⬇️
...devicelink/proxy/rpc/AudioControlCapabilities.java	88% <100%> (+1.63%)	14 <2> (+2)	⬆️
...in/java/com/smartdevicelink/util/AndroidTools.java	6.25% <0%> (-0.57%)	1% <0%> (ø)
...smartdevicelink/encoder/VirtualDisplayEncoder.java	29.31% <0%> (+4.59%)	8% <0%> (ø)	⬇️

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