Communicate PEP 517 hook results via files

[charliermarsh]

Summary

In #1813, we were failing to install scikit-image==0.19.3 from source in Python 3.11. Confusingly, though, the trace showed that the build command exited with status 0...

The issue is that we get results from the PEP 517 hooks by reading from stdout -- that is, we print at the end of the script, and parse the printed output on the other side.

It turns out that for scikit-image, in this case, there was output after the wheel filename:

...
no previously-included directories found matching 'doc/gh-pages'
adding license file 'LICENSE.txt'
writing manifest file 'scikit_image.egg-info/SOURCES.txt'
Copying scikit_image.egg-info to build/bdist.macosx-12.6-arm64/wheel/scikit_image-0.19.3-py3.11.egg-info
running install_scripts
scikit_image-0.19.3-cp311-cp311-macosx_14_0_arm64.whl
INFO:
########### EXT COMPILER OPTIMIZATION ###########
INFO: Platform      :
  Architecture: aarch64
  Compiler    : clang

CPU baseline  :
  Requested   : 'min'
  Enabled     : NEON NEON_FP16 NEON_VFPV4 ASIMD
  Flags       : none
  Extra checks: none

CPU dispatch  :
  Requested   : 'max -xop -fma4'
  Enabled     : ASIMDHP ASIMDDP ASIMDFHM
  Generated   : none
INFO: CCompilerOpt.cache_flush[864] : write cache to path -> /private/var/folders/nt/6gf2v7_s3k13zq_t3944rwz40000gn/T/.tmp5ZPIbv/built-wheels-v0/pypi/scikit-image/0.19.3/hLW_f7wWeGDOPRlSazQXw/scikit-image-0.19.3.tar.gz/build/temp.macosx-12.6-arm64-3.11/ccompiler_opt_cache_ext.py

We need the scikit_image-0.19.3-cp311-cp311-macosx_14_0_arm64.whl line, but we were failing to find it due to all the extra output at the end (presumedly, some kind of atexit logging).

This PR modifies the hooks to instead write their results to files that are passed in by the parent. On the other end, we then read the results back from disk. This makes it much more robust to "other" output in the script.

Closes #1813.

Test Plan

Ran cargo run pip install scikit-image==0.19.3 --reinstall --no-cache-dir on Python 3.11.

[charliermarsh]

These don't need deterministic names (we pass them into the script anyway) but I figured it would help debugging.

[zanieb]

Makes sense!