Add support for by layer interpolation methods to StreamingRenderer

Mass transitioning all resolved issues that have not been updated in the last month to closed state

Checking how this works with layer groups, looks like lining up MapContent.layers with the list of interpolations from the layers may get out of sync with a LayerGroup is involved.

So what you need to make this back port happen? Wait it looks like you have already back ported successfully:

• 13.x: https://github.com/geotools/geotools/pull/834

• 12.x https://github.com/geotools/geotools/pull/835

Note corrected description to https://osgeo-org.atlassian.net/browse/GEOS-6965#icft=GEOS-6965

Hi,
I would like to backport by layer interpolation support for
StreamingRenderer to 13.x and 12.x.

This patch allows to apply different interpolation methods (nearest
neighbor, bilinear or bicubic) for each raster layer included in a render
flow.

Thanks
Mauro