Draft: Feat add clear individual session

[bawahakim]

Description

Fixes #1066

Type of Change

• New feature

Checks

• Changes support all platforms (Android, iOS, Linux, macOS, tvOS)
• Does not break existing functionality
• Implementation is completed, not half-done
• Is there another PR already created for this feature/bug fix

Tests

1. Create any ffmpeg session
2. Confirm the session exists with FFmpegKitConfig.getSessions(); or equivalent
3. At any point, call FFmpegKitConfig.clearSession(sessionId); or equivalent
4. Call FFmpegKitConfig.getSessions(); again
5. Confirm the session is not there anymore

[bawahakim]

@tanersener Coincidentally, I just started working on this right now, and see you working on it as well :D

I've got the part working for iOS/flutter. However, I named the method "clearSession" rather than "deleteSession" to keep it consistent with "clearSessions". What are your thoughts?

[tanersener]

Thanks for the PR!

After reviewing the method name, I felt that clearSession() might suggest clearing resources without fully deleting the session. To avoid confusion, I opted for deleteSession() instead.

This method is already implemented for the native platforms (Android, Apple, Linux) on the development branch. If you'd like to contribute to the Flutter implementation, please submit a PR against development-flutter as we outlined in the CONTRIBUTING guide.