Updates for Current SDK versions

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Which topic?

https://developer.adobe.com/client-sdks/home/current-sdk-versions/

### What's wrong with the content?

Few updates are required for consistency across platforms:
- Indicate Identity, Signal, Lifecycle are bundled with Mobile Core in RN/Flutter
- Indicate rules are supported in RN/Flutter
- High-level list of supported extensions for Roku, similar to other platforms

### What changes do you propose?

_No response_

### Anything else that can help to cover this?

_No response_

Start by reading the current SDK versions page at https://developer.adobe.com/client-sdks/home/current-sdk-versions/ and locate its source in the documentation repository. Update the React Native and Flutter notes for bundled extensions and rules, add a high-level supported-extension list for Roku, and verify the page is consistent across platforms.

Written by the indexing model from the issue text.