Allow a way to override the Agent name for a single request

[jerry-reevo]

Description

Currently we can pass request specific Agent configurations via .override(...) or directly into methods like .iter(...) which is useful when we are running slightly different variants side-by-side (e.g., A/B testing).

It would be helpful if we could also override the Agent's name used for just that request so the specific variant is easily identifiable in traces, etc. I could not find any way to do this other than to create nearly identical Agent(...) instances.

References

No response

[DouweM]

@jerry-reevo I'd welcome a PR that adds name to override, along with anything else you'd find useful!