Android - Rgba8888 support

[vongohren]

Description

This adds support for RGBA_8888 format as CameraX supports this. Ref #550

So it solves #550

• feat: support rgba8888 output

Checklist

Before creating any Pull Request, confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).

• 📕 I read the Contributing page.
• 🤝 I match the actual coding style.
• ✅ I ran flutter analyze without any issues.

Breaking Change

This should not be a breaking change: https://github.com/vongohren/CamerAwesome/pull/1/files#diff-2be105d4e5b13f6f54a34dce7bb62ef5a3a7bcb2f64587e662af5d0306bc57f8R65, as it falls back to the default option

Analyze

I ran flutter analyze and it outputed files I have not touched so I decided to ignore them. Here is current output

Analyzing CamerAwesome...                                               

   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          example/lib/ai_analysis_barcode.dart:131:36 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          example/lib/custom_awesome_ui.dart:37:53 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          example/lib/custom_awesome_ui.dart:39:42 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          example/lib/custom_awesome_ui.dart:51:49 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          example/lib/custom_theme.dart:38:59 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          example/lib/custom_theme.dart:40:48 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          example/lib/custom_theme.dart:52:61 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          example/lib/multi_camera.dart:175:49 • deprecated_member_use
   info • 'whereNotNull' is deprecated and shouldn't be used. Use .nonNulls instead •
          lib/src/orchestrator/states/camera_state.dart:83:51 • deprecated_member_use
   info • 'whereNotNull' is deprecated and shouldn't be used. Use .nonNulls instead •
          lib/src/orchestrator/states/camera_state.dart:127:12 • deprecated_member_use
   info • 'whereNotNull' is deprecated and shouldn't be used. Use .nonNulls instead •
          lib/src/orchestrator/states/photo_camera_state.dart:75:52 • deprecated_member_use
   info • 'whereNotNull' is deprecated and shouldn't be used. Use .nonNulls instead •
          lib/src/orchestrator/states/video_camera_state.dart:38:52 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          lib/src/widgets/awesome_sensor_type_selector.dart:74:32 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          lib/src/widgets/awesome_sensor_type_selector.dart:144:33 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          lib/src/widgets/buttons/awesome_capture_button.dart:113:36 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          lib/src/widgets/buttons/awesome_capture_button.dart:138:36 • deprecated_member_use
   info • 'withOpacity' is deprecated and shouldn't be used. Use .withValues() to avoid precision loss •
          lib/src/widgets/preview/picture_in_picutre_config.dart:41:45 • deprecated_member_use