feat(tier4_system_msgs): add mrm behavior msg

[TetsuKawa]

Related Links

block-diagrams
autoware.universe PR

Description

This PR adds mrm behavior msg to tier4_system_msgs directory.
It is used to direct mrm execution from redundancy_switcher_interface to mrm_stop_operator on a Sub ECU in a redundant configuration.

Remarks

Node Description

• redundancy_switcher_interface: convert udp packets sent from redundancy switcher to ros2 topic, and ros2 topic to udp pakcets.
• mrm stop operator: placed on the Sub ECU side, it sets the velocity limit when the Main ECU has failed and the Sub ECU is being used.

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