feature: add zlib to cpython build

[chrisdickinson]

Some packages (in particular, aiohttp) require CPython to be built with zlib enabled. I believe this is known work but I wanted to create a tracking issue here for it. (I took a stab at this via building in wasi-wheels but bounced off the problem 😅)

[kyleconroy]

For inspiration, I believe that the Python builds from https://github.com/singlestore-labs/python-wasi and https://github.com/vmware-labs/webassembly-language-runtimes have zlib support.