Persistent storage

[LGro]

It seems like there is no established good practice to do persistent data schema migrations on app updates with hydrated_bloc. Alternative candidates include:

• https://pub.dev/packages/hive/ but it's not clear to me how a background process would access the same box that the main process is using, which might be necessary when we're receiving updates unless we bring the information to a single process first and then persist it from there
• https://pub.dev/packages/sqflite seems like a classic, but is supposedly much slower than Hive
• https://pub.dev/packages/goose might help migrate hydrated bloc

[LGro]

I'm more leaning towards adding persistent storage as a data provider via a repository to the app, following the Bloc architecture recommendations; potentially still using Hive.

[LGro]

Trying with Hive and data provider / repository following BLoC pattern (6ed5eaa4e193fe96df0aa13bffa0dc9142a058bc)