Cache parsing of version and names

[bdraco]

extracted from pypa/pip#12316

[uranusjr]

I’m not sure packaging is the right layer for this tbh.

[bdraco]

I’m not sure packaging is the right layer for this tbh.

Do you have a suggestion on where else it should go?

I was hoping it could be done in pip but its the Version object construction that is expensive and they are nearly all created in packaging it self so I didn't find a way to do something like the below in pip:

https://github.com/pypa/pip/blob/dfaac0a6886872088d565b3c77cb4c6328a1f941/src/pip/_internal/utils/packaging.py#L37

[brettcannon]

I also agree that we shouldn't be the caching layer for anyone; this package is way too low-level to making those sorts of decisions for projects.