feat(android): automatically update keyboards and lexical models

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From a team review of the Keyman for Android UX (#7161)

We should consider automatically updating keyboards and lexical models. This should probably be a user setting although too many settings is a pain.

Most devices automatically get updates of Keyman. So long as we treat regressions as a serious blocker and address them promptly, the benefits of also updating keyboards + LMs automatically probably outweigh the downsides. It also means one less thing that end users have to try and keep up-to-date themselves.

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**Keyman for Windows/macOS/Linux/iPhone/iPad/Android:**
- Device: Samsung A90 5G
- OS: Android 12
- Keyman version: 15.0.269-stable