--skip-split-multis doesn't work right with ogr process on benchmark

[cholmes]

Description

Right now if you try to run --skip-split-multis on the ogr process in the benchmark command it will return a table of super fast responses. This is because the operations isn't actually running - with 'convert' it just informs that the process doesn't yet work. This is fine for convert, but for benchmark we should probably at least print a WARNING that says the times aren't valid, and maybe even just leave it off the results. Or we could run it with skip-multis, since the timing is likely representative - the difference for duckdb and pandas isn't significant. Could also just try to implement it, but I'm not sure if it's possible to do with pure command line calls.

[giswqs]

It would be great to have some command line and Python examples that can run and reproduce issues. We can add those to the automated tests so that errors can be captured in every push.

No worries about the frequent PyPI releases. It is quite normal for a new project.