Integrate LeakCanary for production OOM/Leaks monitoring

### Description

LeakCanary has a whole section on how to integrate heap analysis with bugsnag https://square.github.io/leakcanary/leakcanary-for-releases/.

We could do something similar and either send a new event, or send the analysis as an attachment or context for OOM events (depending on how long the analysis takes).

This has to be a new integration, because of dependency on leakcanary.

There's also a bunch of recipes here: https://github.com/square/leakcanary/issues/2119

先從 LeakCanary production integration guide 和 issue 中連結的 recipes 開始，接著追蹤此 SDK 對 Android 事件與附件的處理。考量分析時間，決定應將分析作為新事件、附件或 OOM context 回報。完成標準是具備可運作的 production integration，並有涵蓋所選回報行為的測試。

由索引模型根據 Issue 內容生成。