DHCP Relay Stress Test v1

[yyynini]

Description of PR

Summary: The DHCP Relay Stress Test Plan is to evaluate the performance of the DHCP relay service under maximum load conditions. This test is to ensure the service can handle under a high traffic condition and verify the CPU utilisation.

test description: https://github.com/sonic-net/sonic-mgmt/issues/3614

Type of change

• [ ] Bug fix
• [ ] Testbed and Framework(new/improvement)
• [X] Test case(new/improvement)

Back port request

• [ ] 202012
• [ ] 202205
• [ ] 202305
• [ ] 202311
• [ ] 202405

Approach

What is the motivation for this PR?

How did you do it?

How did you verify/test it?

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

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