[yang] Need Yang for BGP_VOQ_CHASSIS_NEIGHBOR table

[ganglyu]

Description

We don't have yang model about BGP_VOQ_CHASSIS_NEIGHBOR table.
Please refer to sonic-net/sonic-utilities#2029

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[ganglyu]

@jmmikkel Can you add Yang for BGP_VOQ_CHASSIS_NEIGHBOR table?

[zhangyanzhao]

Wait for the Yang model creation.