feat: refactor and add e2e tests

[DorianMazur]

Motivation

This PR introduces end-to-end (e2e) tests to ensure the library functions as expected. The existing Java unit tests were outdated (last updated 3 years ago), only covered Android (with no iOS support), and were difficult to maintain. Due to these issues, I decided to remove the unit tests, as they were no longer helpful and were complicating the development process.

Description

This PR includes the following changes:

1. Added e2e tests using Detox: I chose Detox over Maestro because Detox provides better support for biometrics and adb commands, even though both tools have a similar setup complexity (in my opinion)
2. Refactored the codebase to TypeScript: I transitioned the code from Flux to TypeScript, as it is now a widely accepted standard.
3. Reorganized code structure: I moved the Android-specific code to an android directory and the iOS-specific code to an ios directory for better organization.
4. Updated the codebase: The code has been updated to support the latest versions of React Native.
5. Integrated react-native-bob-builder: This tool is now used to build the library.
6. Improved the example app: I refactored the example app to use react-native-test-app, making it easier to update to newer versions of React Native. This also sets the stage for potentially adding e2e tests for different React Native versions.

[oblador]

Amazing! Left a few nits and a question around testing.

[oblador]

I feel like there are quite a few cases in this test suite not covered by the e2e from what I can tell. Can we cover them too (esp around which crypto engine picked and migration paths)?

[DorianMazur]

Are you talking about RSA, AES and migration from FB to AES?

[oblador]

Yeah

[DorianMazur]

Done! 👍 Once the workflow is complete, I’ll merge it.