added generic location message to shim (set with a ros_param).

Caileigh Fitzgeraldrequested to merge
3-need-generic-location-message-to-generate-fake-rxd into main

added generic location message to shim as a ros_param (~generic_location_topic). Will generate fake CARXDs from sparser location message on rx_location topic. Tested in sim

Closes #3 (closed)

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