feat(compare_map_filter): add voxel height offset in comparemap

[YoshiRi]

Description

This PR tries to move compare map voxel downward so that the pointclouds above the map points will survive.
This is aiming to prevent compare map to remove pointclouds nearly on the ground.

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Tests performed

Notes for reviewers

Interface changes

Effects on system behavior

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[YoshiRi]

memo
This PR has undesired drawback that the top of low objects also not filtered by compare map so we do not want to apply this in awf. Close it.