[smart-switch] Extend config generator for t1-smartswitch topology.

[oleksandrivantsiv]

Why I did it

The Smart Switch includes two types of devices (Switch and DPU) that require the sample configuration. Generate Smart Switch sample configurations for Switch or DPU based on the device type.

Work item tracking

• Microsoft ADO (number only):

How I did it

Extend the sample config generator for t1-smartswitch topology.

How to verify it

Run sonic-cfggen UT.

Which release branch to backport (provide reason below if selected)

• [ ] 201811
• [ ] 201911
• [ ] 202006
• [ ] 202012
• [ ] 202106
• [ ] 202111
• [ ] 202205
• [ ] 202211
• [ ] 202305

Tested branch (Please provide the tested image version)

• [ ]
• [ ]

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)