feat(tier4_system_msgs): add election election msg

[TetsuKawa]

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block-diagrams
autoware.universe PR

Description

This PR adds election communication msg to tier4_system_msgs directory.
It is published from redundancy_switcher_interface and represents the raw data of the election msg being sent between redundnacy_switchers. Mainly it is used for debug purposes.

Remarks

Node Description

• redundancy_switcher_interface: convert udp packets sent from redundancy switcher to ros2 topic, and ros2 topic to udp pakcets.

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