[NR-293384] Implement AEI trace reporting

[cthomas-newrelic]

Following the existing store-and-forward pattern used by log reporting, add a new reporter and sender component to manage AEI trace uploads. Traces are cached to disk, uploaded during harvest cycles and removed from disk once the upload is successful or has expired.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 58.41584% with 84 lines in your changes missing coverage. Please review.

Project coverage is 57.56%. Comparing base (bb25f63) to head (9bc3a8c).

Files with missing lines	Patch %	Lines
...m/newrelic/agent/android/aei/AEITraceReporter.java	48.14%	49 Missing and 21 partials :warning:
...elic/agent/android/aei/ApplicationExitMonitor.java	61.90%	3 Missing and 5 partials :warning:
...com/newrelic/agent/android/aei/AEITraceSender.java	92.68%	3 Missing :warning:
.../com/newrelic/agent/android/aei/SessionMapper.java	50.00%	2 Missing :warning:
...relic/agent/android/payload/FileBackedPayload.java	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #302 +/- ## ============================================= + Coverage 57.50% 57.56% +0.05% - Complexity 3398 3442 +44 ============================================= Files 328 330 +2 Lines 16803 16989 +186 Branches 1835 1858 +23 ============================================= + Hits 9663 9779 +116 - Misses 6105 6153 +48 - Partials 1035 1057 +22 ```

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[cthomas-newrelic]

Hmm, flakey tests. Hold off on review until resolved.

[cthomas-newrelic]

Do -Over: Closed to clean up and rebase branch.