Bug report

Describe the bug

By looking at the code here, it seems like whenever user opens the app while offline, the session is deleted.

const { error } = await this._callRefreshToken(currentSession.refresh_token)
if (error) {
  console.log(error.message)
  await this._removeSession()
}

To Reproduce

1. Create an app using Supabase
2. Sign in with your favorite method
3. Turn on air plane mode
4. Open the app and your are signed out

Expected behavior

Session should not be deleted when offline, and refreshing session should be attempted upon device regaining internet connection.

Additional context

I guess this issue has two challenges that it needs to overcome:

1. detect network error and in such case, do not remove session (I guess this is pretty easy)
2. in case the error was a network error, detect when the device becomes online again and retry session recovery