Add tool to detect supported platforms

[TheTripleV]

The tool finds maven_lib_downloads in a given pyproject.toml and finds supported platforms by scraping html. A brute force option is given when html is not available (rev).

Ex.

robotpy-build parse-maven pyproject.toml

Output:

Wrapper / static_lib :: hal
Artifact ID :: hal-cpp

This repo appears to provide sources.
The name of the source file is: sources

supported_platforms = [
    { os = "linux", arch = "raspbian" },
    { os = "linux", arch = "aarch64bionic" },
    { os = "linux", arch = "x86-64" },
    { os = "linux", arch = "athena" },
    { os = "osx", arch = "x86-64" },
    { os = "windows", arch = "x86" },
    { os = "windows", arch = "x86-64" },
]

[virtuald]

This is really cool, thanks!

[virtuald]

Can we pull this from platforms.py instead?

[TheTripleV]

I've changed it to use known os and archs from platforms.py. This only applies when the brute force flag is used. Regularly, with html scraping, it just finds all available platforms in the html. As far as I know, the only difference between the two modes is detection of aarch64bionic, raspbian, and jetsontx.