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library: Add imagery Python library module to grass.script
This PR adds a new imagery module to grass.script. For the time being it has just one function, that returns a dictionary for an imagery group with the contained maps and metadata.
It addresses #3750
One last question about this one: does it wire up everything in order for the sphinx docs to be generated correctly for it? For the makefiles it is probably enough, I didn't search more.
@wenzeslaus would you mind having a look at this if your requested changes are properly addressed and approve or comment?