[SmartSwitch] Add a new API for the DPU chassis to query dataplane and midplane states #509
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Description
Add a definition for a new DPU chassis API required for querying DPU dataplane and midplane states.
Motivation and Context
A new API is required to enable querying of the DPU dataplane and midplane states. These states will be monitored by the chassisd service running on the DPU and pushed to the CHASSIS_STATE_DB upon any changes. This will allow the NPU to subscribe to DPU state changes.
How Has This Been Tested?
The API tests will be added in scope of chassisd changes.
Additional Information (Optional)