Prevent alias (windows function) to store all arguments in one string instead of an array of strings

[aguiot]

Hi,

We are facing an issue when defining alias in the package.py of a windows package.
Arguments passed to the python script defined in the alias receive all arguments in one string instead of an array of strings.

Here is a way to reproduce it:

1. the python script (test/ test_arg.py)

# coding: utf8

import sys
import argparse  # noqa: I100


if __name__ == "__main__":

    argv = sys.argv[1:]

    parser = argparse.ArgumentParser()
    parser.add_argument("foo", type=str)
    parser.add_argument("-b", "--bar", type=str, default="toto")
    args = parser.parse_args(argv)

    print(argv)
    print(args)

2. the alias defined test package (test/package.py)

    import os

    alias(
        "arg_test",
        "python {}".format(
            os.path.join("{root}", "test_arg.py")
        ),
    )

3. tests

When calling arg_test like this: rez env test -- arg_test blah --bar titi, we would expect:
argv = ['blah', '--bar', 'titi'] and args = Namespace(bar='titi', foo='blah')

But unfortunately, we have
argv = ['blah --bar titi'] and args = Namespace(bar='toto', foo='blah --bar titi')

because the sys.argv is not split