[Mellanox] Add support for platform SN5400

[DavidZagury]

Why I did it

Add support for new platform x86_64-nvidia_sn5400-r0

Work item tracking

• Microsoft ADO (number only):

How I did it

Added all config files that are needed to support SN5400.

How to verify it

Run Platform tests

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)