Restructure Argument Clinic CLI

Suggesting to ...:

make the clinic tool a well-behaved command-line citizen; write to stderr, not stdout, on error (partly depends on Rework Argument Clinic error handling #107468)
put the whole CLI in main, making it easier to mock the tool in the test suite (currently we use subprocesses, which is slow, and requires several lines of boiler-plate test setup code)
~~Introduce CLIError and use it for usage errors~~ Used ArgumentParser.error instead.

pythongh-107467: Restructure Argument Clinic command-line interface

gh-107467: Restructure Argument Clinic command-line interface (#107469)

@erlend-aasland

@erlend-aasland is there anything left to do in this issue? Looks like #107469 captured all of this (maybe save stderr/stdout?)

A

Thanks for the heads-up! Yes, this can be closed.

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