Fixed crashes due to large images.

[AdiK5050]

Issue

• Earlier, the ImageSelector used to load full image in the memory which led to OutOfMemoryError and eventually an app crash for larger images.

Fix

• The Image doesn't load into memory in it's actual size. Rather it's downsampled according to the current window size of the app and then returns the downsampled image which is much lower in size and will prevent OutOfMemoryError.

What Need To Be Changed?

• nothing needs to be changed, just an optional lambda can be utilised to show state since it may take significant time to process and return the image.
• loadingStateis the callback which passes a boolean. Since downsampling may take a few seconds, we don't want it to feel like the UI is frozen so we can use this state to show a full screen loader. It returns true when the image is downsampling and false when the downsampling is complete.