PEP 517 build support

[corbettht]

Hi,

First, thanks for the great package -- I have been experimenting with using it for fast catalog lookups from large binary tables, and am really impressed with the speeds.

I've made a few changes to the build process to support a PEP 517 style build, with the goal of getting it to work nicely with packaging tools like Poetry (https://python-poetry.org). As-is, the build fails when installing with Poetry due to the lack of numpy (and possibly with other tools that build in an isolated-environment, though I have not tested them).

Would you consider these changes for main?

[corbettht]

Hi, Sorry to double post here, but I think this may be broken more widely as of pip 23.1 per the broad tree of discussions here: pypa/pip#8559.

Thanks again