Commits on Nov 19, 2019

1. Closes mozilla-mobile#2229: Encrypted-at-rest FxA state storage support …

   This patch adds a version of `AccountStorage` which is backed by an encrypted-at-rest shared-prefs implementation,
   `SecureAbove22Preferences`. As the name suggests, encryption at rest is enabled only for Android API levels 23+.
   Otherwise, plaintext storage is used. `SecureAbove22Preferences` will handle API level upgrades behind the scenes,
   if necessary.
   
   In order to support rolling this out, `SecureAbove22AccountStorage` automatically migrates account state if it was
   present in `SharedPrefAccountStorage`. And vice-versa, `SharedPrefAccountStorage` will automatically migrate account
   state if it was present in `SecureAbove22AccountStorage`. This allows applications to easily switch between two
   implementations, without any ill-effects.
   
   In order to monitor storage implementations for abnormalities (such as disappearing encryption keys), an optional
   `CrashReporter` instance may be configured now via FxaAccountManager.
   
   `DeviceConfig` gained a `secureStateAtRest` flag, which allows applications to specify if they'd like to encrypt
   account state. This config object isn't a perfect fit for this flag, but it's close enough conceptually.

   Grisha Kruglov committed Nov 19, 2019
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