Forward CLI args to application

[davidbrochart]

Problem

Currently, FPS "captures" CLI arguments and treats them only as configuration options. Anything else passed to the CLI fails, such as subcommands, or arguments and options that are not configuration-related.
For instance, in quetz run test_quetz --copy-conf ./dev_config.toml --dev --reload:

• run is a subcommand.
• test_quetz is a required argument.
• --copy-conf is an option that has value ./dev_config.toml.
• --dev and --reload are flags.

Proposed Solution

FPS should "forward" any subcommand, argument and options that are not configuration-related to the underlying application.

Additional context

This is needed if we want to use FPS in Quetz.

[adriendelsalle]

I would probably have a different approach here by "just" defining another CLI using typer.
Why not reusing the same approach as what's done in Quetz CLI?

https://github.com/mamba-org/quetz/blob/dbbe519a93ec304319654eabca22dbce791eb13d/quetz/cli.py#L548