Manually close ImageDecoder.

[colinrtwhite]

Fixes #1107.

ImageDecoder's source says we shouldn't call this method manually, but it looks like it isn't cleaned up unless it's called manually.

[leandroBorgesFerreira]

I still get the problem if I enable strictMode. But one thing I notice is that if SVG is the first page instead of the third, it stops breaking. So if I change:

val assetType: MutableStateFlow<AssetType> = MutableStateFlow(AssetType.SVG)

In MainViewModel in the main branch, the leak doesn't happen anymore... you need to change the pages in the ViewPager and then the problem starts to happen

[colinrtwhite]

@leandroBorgesFerreira With the same stack trace? I think changing the initial page to SVG likely only masks the exception. Unfortunately I'm not sure what else can be done as Coil doesn't have access to the input stream allocated by ImageDecoder.FileSource.

[colinrtwhite]

Going to merge this in as calling ImageDecoder.close should close the input stream according to the source.