FR-18979 - Add tests

[alex-minaiev-frontegg]

Set up a Frontegg account:

1. Enable password Email sign on via Login Box;
2. Enable Google Social logins via Login Box;
3. Enable Apple Social logins via Login Box.

Set up environment:

1. Set up patrol plugin:
   run:

patrol doctor

Then set up all failure items (all items should be green);
2. Add .patrol.env to /example/ folder of the project. Use /example/.patrol.env.example as an example;
3. Change fronteggDomain and fronteggClientId into /example/android/app/build.gradle if needed;
4. Change baseUrl and clientId into example/ios/Runner/Frontegg.plist if needed;

Set up Devices:

1. Create Android emulator and iPhone emulator with last stable OS version(18.2 currently).
2. Login into Google and Apple for the first time. Disable 2fa.

Run integration tests:

zsh run_integration_test.sh -a emulator-5554 -i 'iPhone 16 Pro Max' -t integration_test/src/specific_test.dart

Where:
-i - iOS device. Optional;
-a - Android device. Optional;
-t - Path to tests. Optional. Default value is 'integration_test/src/'.