docs: OPSQLite large datasets on android 12 (Temporary store memory option)

[Chriztiaan]

For large datasets on Android 12, the default temp store (file) may cause disk IO errors, in the past we resolved this for RNQS by setting a build flag to use the memory option.

This PR adds a readme entry on how a user can configure their package.json to set the option for OPSQLite, ideally there is a way for us to define this as part of the code generation.

Reference PR from RNQS: powersync-ja/react-native-quick-sqlite#28

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