Expose pex's `--check` validation

[huonw]

Is your feature request related to a problem? Please describe.

In 2.1.148 (pex-tool/pex#2247 / pex-tool/pex#2253), PEX adds support for --check=... to give build-time warnings/errors about --layout=zipapp PEXes that are likely to not be able to be loaded by a Python interpreter, e.g. so many files or large enough to require "ZIP64" extensions, which zipimport doesn't handle (python/cpython#77140).

This likely affects large PEXes including machine learning packages like PyTorch.

Describe the solution you'd like

For the pex_binary target:

• ensure that any warnings are exposed
• consider providing a pass-through check option somehow

Describe alternatives you've considered

A general mechanism for showing warnings

Additional context

N/A

[huonw]

See pex-tool/pex#2253 (comment) for exploration of showing this via --pex-verbosity=1.

[cburroughs]

This can be closed now, correct?

[huonw]

Yeah! #20481 / #20480 seen to get this done. Thanks @cburroughs