Add Reset Map

[lekoook]

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Basic Info

Info	Please fill out this column
Ticket(s) this addresses	#640
Primary OS tested on	Ubuntu 22.04
Robotic platform tested on	(Turtlebot 4 Gazebo Sim)

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Description of contribution in a few bullet points

• Added a new slam_toolbox::Reset Service.
• Upon calling of said service, the current map will be "cleaned" and reset back to the initial state.
• A new clean map can then be generated from there.
• slam_toolbox::Reset request also contains a boolean pause_new_measurements that if set to true, subsequent new scans will be ignored until a slam_toolbox::Pause is called to resume.
• Tested with nodes: async_slam_toolbox_node, sync_slam_toolbox_node, localization_slam_toolbox_node

Description of documentation updates required from your changes

• Added a new service with the default Service name: /slam_toolbox/reset and message type: slam_toolbox::Reset
• Proposed API description: Reset current map back to the initial state

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Future work that may be required in bullet points

• Considerations for experimental nodes: map_and_localization_slam_toolbox_node, lifelong_slam_toolbox_node

[SteveMacenski]

Nice contribution, thanks!