Enable the menu name to depends on the folder name of the root prefix

[ericpre]

Currently, the name of the menu needs to be defined in the shortcu config json, which indirectly makes the conda recipe specific to a distribution.
The idea of this PR is to use the name of the distribution (Anaconda, Miniconda, Miniforge, etc.) as the name of the menu in the start menu. The name of the folder of the root prefix is used to determine the name of the distribution - this is the case by default. I am not aware of a better way to get the name of the distribution.

This PR is primarily for https://github.com/conda-forge/miniforge_console_shortcut-feedstock/blob/master/recipe/console_shortcut.json, and with this PR, its shortcut config could be changed to:

{
    "menu_name": "${DISTRIBUTION_NAME}${PY_VER}",
    "menu_items":
    [
        {
            "name": "${DISTRIBUTION_NAME} Prompt",
            "system": "%windir%\\system32\\cmd.exe",
            "scriptarguments": ["/K", "${ROOT_PREFIX}\\Scripts\\activate.bat", "${PREFIX}"],
            "icon": "${MENU_DIR}/console_shortcut.ico"
        }
    ]
}

More generally, this would also be useful for other conda-forge recipes (spyder, notebook, etc.)

[isuruf]

@chenghlee, @cjmartian can you review this?

[ericpre]

Thanks @cjmartian and @chenghlee for the review. I have edited the wiki accordingly: https://github.com/ContinuumIO/menuinst/wiki/Menu-Shortcut-Config-Structure/_compare/632fbc84251c8a8093e1b56b0b5314d23c1e946b

[github-actions]

Hi there, thank you for your contribution!

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Thanks!