test:add simple test case

[superrxan]

Replace this text with your description here...

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[jzhou77]

This workload does very simple read and write. Why do we need this new one? The existing workloads should already capture the functionality, e.g., CycleWorkload.

[superrxan]

sorry, I just start learning the DST, want porting it to our own code. this is just a test.

[jzhou77]

sorry, I just start learning the DST, want porting it to our own code. this is just a test.

No worries. Since the intent is not to merge the PR, I'll convert it to draft and you can close it when your test is over.