Feature request: add support for https in custom jar directives

[jpabscale]

Is your feature request related to a problem? Please describe. Colon (:) does not seem to be allowed in custom jar paths (Windows path?).

Describe the solution you'd like Custom sources support https but cannot be used in custom jars. There seems to be a feature discrepancy, so please consider adding https support for custom jars (and Windows paths in all directives involving OS paths).

Describe alternatives you've considered Using shell scripts to download custom jars first before launching scala-cli.

Additional context None.