Specialize std::hash for NodeId/SubmapId #1907
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Signed-off-by: Bosco Siu <opensource@qadyence.com>
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Our software uses Cartographer directly without ROS, so it utilizes the submaps API and the
mapping::NodeIdandmapping::SubmapIdtypes extensively.This change adds
std::hash<T>specializations to these types so they can be used with STL unordered associative containers.