this would allow to easily allow freeze the frame when we takePickture()

currently it's impossible to seamlessly show taken image, because the image buffer is not exposed, and if it would be exposed, i doubt there would be a way to seamlessly display it in Image.memory, because it anyway will take some time to process and will show black frame a few vsync frames, which should be addressed by #75750, i guess

blockers

• add freeze parameter to Texture and TextureBox #75737
• [camera] Migrate the camera plugin to nnbd #75228 - as camera that's not migrated to nnbd yet can't depened on camera_platform_interface that's already migrated

see also
flutter/plugins#3531 (comment)