Collect Advertising ID from Amazon Fire devices.

[f2prateek]

Reference:
https://developer.amazon.com/public/solutions/devices/fire-tv/docs/fire-tv-advertising-id#verifying-and-responding-to-the-users-advertising-id-choices

[f2prateek]

cc @ladanazita @tonyxiao

[codecov-io]

Codecov Report

Merging #536 into master will increase coverage by 0.24%.
The diff coverage is 44.44%.

@@            Coverage Diff             @@
##           master     #536      +/-   ##
==========================================
+ Coverage   82.97%   83.22%   +0.24%     
==========================================
  Files          30       30              
  Lines        2426     2438      +12     
  Branches      275      277       +2     
==========================================
+ Hits         2013     2029      +16     
+ Misses        330      326       -4     
  Partials       83       83

Impacted Files	Coverage Δ
...va/com/segment/analytics/GetAdvertisingIdTask.java	60.86% <44.44%> (+25.57%)	⬆️

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