Consider splitting pantsbuild.pants dist into pure python and native portions.

[jsirois]

Right now the OSX and linux pantsbuild.pants wheels combine for 20803025 bytes in a multiplatform pex.
If we broke out a very narrow wheel to own just the native engine subsystem / native_engine.so resource file, we'd have 3 wheels combining for 20380596 bytes. This would be a very modest ~500KB (~2%) size savings, so it may not be worth it.

[cosmicexplorer]

This would be way in the future, but #5815 involves stuffing a .so into a python_dist(), and some of the code there could be used in eventually building native_engine.so in pants and packaging the result (which we're obviously nowhere near right now). Vaguely related to the subject of this issue.

[Eric-Arellano]

I believe this proposal has become stale, and instead we'd rather put energy into #7369.