Add in/out ColorSpace to ImageDecoder

Bug: 76448408
Test: I851173b771668f0e6712bebfe06bfb8559801199

Add ImageInfo.getColorSpace() for retrieving the default ColorSpace.
This matches BitmapFactory.Options.outColorSpace.

Add ImageDecoder.setTargetColorSpace() for choosing a new ColorSpace.
This matches BitmapFactory.Options.inPreferredColorSpace.

Rename setSampleSize to setTargetSampleSize to match setTargetSize and
setTargetColorSpace.

Change-Id: If2f4e755dfc163f754849f896de24659198973db