Handle executor errors

[andrlee]

Problem:
Ran on crash while doing pre-release testing with maps sdk test app. MapSnapshotter test chocked up the executor's queue and resulted in the its crash:

    Process: com.mapbox.mapboxsdk.testapp, PID: 11852
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mapbox.mapboxsdk.testapp/com.mapbox.mapboxsdk.testapp.activity.fragment.MultiMapActivity}: android.view.InflateException: Binary XML file line #59: Binary XML file line #59: Error inflating class fragment
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2679)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2740)
        at android.app.ActivityThread.-wrap12(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1487)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6164)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)
     Caused by: android.view.InflateException: Binary XML file line #59: Binary XML file line #59: Error inflating class fragment
     Caused by: android.view.InflateException: Binary XML file line #59: Error inflating class fragment
     Caused by: java.util.concurrent.RejectedExecutionException: Task com.mapbox.android.telemetry.MapboxTelemetry$4@cb9ad20 rejected from java.util.concurrent.ThreadPoolExecutor@48ea6d9[Running, pool size = 3, active threads = 3, queued tasks = 0, completed tasks = 1]

Solution:
Use more robust and universal for this use case LinkedBlockingQueue when events need to sit in the high priority queue and wait for the immediate delivery. Handle executor's errors.

Test:
Re-tested with maps sdk test app.

[codecov]

Codecov Report

Merging #365 into master will decrease coverage by 0.02%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #365      +/-   ##
============================================
- Coverage        57%   56.98%   -0.03%     
  Complexity      488      488              
============================================
  Files           101      101              
  Lines          3154     3157       +3     
  Branches        215      215              
============================================
+ Hits           1798     1799       +1     
- Misses         1269     1271       +2     
  Partials         87       87