Indoor Scene Generation also generates outdoor terrain

[SergioArnaud]

The command provided in the readme to automatically generate indoor scenes takes too long (2 hours) the reason is that it's unecesarilly generating all the terrain of the outdoor scene, see img

I added the fast_solve.gin and now it takes ~20 mins (there might be a better way tho, but the main idea is to not generate the outdoor terrain when generating indoor scenes). Example command below:

screen python -m infinigen.datagen.manage_jobs --output_folder outputs/my_dataset --num_scenes 1 --pipeline_configs local_256GB.gin monocular.gin blender_gt.gin indoor_background_configs.gin --configs singleroom.gin **fast_solve.gin**--pipeline_overrides get_cmd.driver_script='infinigen_examples.generate_indoors' manage_datagen_jobs.num_concurrent=16 --overrides compose_indoors.restrict_single_supported_roomtype=True 

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