Benchmark suggestion: deepcopy

[eendebakpt]

One python method that is currently not in the pyperformance benchmarks is deepcopy (at least not in the benchmarks that execute on my system).

Can we add a benchmark specifically for deepcopy?

In #91610 (reimplement deepcopy in C) there is a simple benchmarking script for deepcopy. It is a simple execution of deepcopy on a dict and a dataclass. The benchmark is really simple (not embedded program), but it is representative for the cost of deepcopy that I encountered in larger projects.

If required, I can create a PR with a benchmark similar to the one in #91610.

[ericsnowcurrently]

I'd say give writing the benchmark a try.

[eendebakpt]

@ericsnowcurrently #201 is the PR for the benchmark