Import utils from sub-submodules

[sjmonson]

Summary

Prereq for some work on deferring imports. utils are designed to be self-contained anyways so this is a small lift.

Test Plan

As long as all tests pass I think we should be good.

---

• "I certify that all code in this PR is my own, except as noted below."

Use of AI

• Includes AI-assisted code completion
• Includes code generated by an AI application
• Includes AI-generated tests (NOTE: AI written tests should have a docstring that includes ## WRITTEN BY AI ##)

[dbutenhof]

That looks straightforward!

[sjmonson]

Tangential to this I've noticed in a few PRs that people don't quite understand the import hierarchy. Probably should codify it in the documentation somewhere, but for now here is a rough draft of what I think we are aiming for:

graph TD
    subgraph "Utils"
        Util[Messaging<br/>...]
    end
    
    subgraph "Extras"
        Extra[vLLM<br/>vision<br/>audio]
    end
    
    Schema
    
    Data
    
    Scheduler
    
    Backends
    
    subgraph "Benchmark"
        Benchmarker[Benchmarker<br/>...]
    end
    
    Benchmark --> Data
    Benchmark --> Scheduler
    Benchmark --> Backends
    Benchmark --> Schema
    Benchmark --> Util
    
    Data --> Schema
    Data --> Extra
    Data --> Util
    
    Scheduler --> Util
    Scheduler --> Schema
    
    Backends --> Util
    Backends --> Schema
    
    Extra --> Util

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