Rename `basesize` to `batch_size`?

[`pmap()`](https://docs.julialang.org/en/v1/stdlib/Distributed/#Distributed.pmap) supports the `batch_size` parameter, which AFAICT is the same as the `basesize` parameter of [`ThreadsX.map()`](https://tkf.github.io/ThreadsX.jl/dev/#ThreadsX.map) except for the default value. I think it would make sense to use the same name in both?