python: Support application factories

Adds support for the app factory pattern to the Python language module.
A factory is a callable that returns a WSGI or ASGI application object.

Unit does not support passing arguments to factories.

Setting the `factory` option to `true` instructs Unit to treat the
configured `callable` as a factory.

For example:

    "my-app": {
        "type": "python",
        "path": "/srv/www/",
        "module": "hello",
        "callable": "create_app",
        "factory": true
    }

This is similar to other WSGI / ASGI servers. E.g.,

    $ uvicorn --factory hello:create_app
    $ gunicorn 'hello:create_app()'

The factory setting defaults to false.

Closes: https://github.com/nginx/unit/issues/1106
Link: <https://github.com/nginx/unit/pull/1336#issuecomment-2179381605>
[ Commit message - Dan / Minor code tweaks - Andrew ]
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

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