Added option to use InMemory CoreData for logs

[z-turk3]

• Adds LoggerStore Option to opt-out of the persistent on device storage of the SQL lite database
• Can be used in cases where for security reasons user logs must not be stored on the device as they can contain sensitive data like the request token
• Adds test to confirm in memory configuration

[z-turk3]

Hey @kean, I have a specific use case where I can not store the logs on the device data because the client considers this as a security vulnerability. In order to mitigate this, I added the option to use Core Data in memory storage type which won't create the sql lite file on the device.

I hope this change works for you or if you have a different approach for my issue I'm all ears 🙂

[kean]

Nice addition, thank you!