NDK JSON Event Writer

[lemnik]

Goal

Replace the binary event writer with a signal-safe JSON encoder.

Design

Using the same JSON encoder we use in bugsnag-cocoa our signal handler now dumps the event state directly as JSON, allowing more flexibility in the in-memory event model.

The native events are still written to the native directory since the discardClasses cannot be evaluated during the crash. Instead a new ReportDiscardScanner class will evaluate discardClasses and enabledReleaseStages on delivery, using a JsonReader to allow early-exit when either:

• the event should discarded, or
• both the event classes, and release stage have been checked

Testing

Relied on existing tests, with a simple unit test to ensure that legacy native events are discarded.

[bugsnagbot]

Android notifier sizes

Format	Size impact of Bugsnag (kB)	Size impact of Bugsnag when Minified (kB)
APK	1844.42	1668.69
arm64_v8a	626.95	450.82
armeabi_v7a	561.42	385.29
x86	700.66	524.53
x86_64	671.99	495.86

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