Setup SQLite extension

[vidbina]

We need to have https://github.com/andpor/react-native-sqlite-storage set up for Android and iOS. Please deliver at least one separate commit per todo :wink: which should make cherry-picking easy, if needed at a later stage.

TODO

• [x] Setup SQLite for iOS
• [ ] Test CREATE_TABLE for table records with the fields:
  • description STRING
  • description STRING
  • category STRING
  • attachment STRING
  • value_cents BIGINT stores all monetary values in cents in order to eliminate rounding errors that may surface when floats are used (with 32 bit integers this should set us up for at most 4294967295 cent units which should work for currencies that aren't inflated like crazy)
  • value_currency CHAR(3) in ISO 4217:2015 (use the string EUR for euros, USD for US dollars and XTS as a test currency)
  • datetime_string CHAR(29) in ISO 8601 which should allow us to save a localised time
  • datetime_epoch DATETIME DEFAULT CURRENT_TIMESTAMP automatically saves the elapsed seconds since epoch
• [ ] Test INSERT and UPDATE queries on a single example from the records sample set
• [x] Setup SQLite for Android

[vidbina]

Deliver all commits into the setup/sqlite branch. Try to commit everything for iOS separately and everything for Android separately as well.