Replace dependency on typer, which is no longer supported/updated

[mborsetti]

Typer is creating dependency conflict hell, and turns out "It’s not clear if this project will be maintained in a sustainable way in the future or not." If there's a way to use some other package or built-in functionality it would be welcomed.

fastapi/typer#313:

A nontrivial patch is required (#280, #278) since this library depends heavily on click 7.x internals.

The project is maintained solely by @tiangolo.

• Via Twitter, they have expressed an intent to spend more time on Typer and FastAPI
• They have been active recently in https://github.com/tiangolo/fastapi/
• They made a new release of https://github.com/tiangolo/typer-cli/ last month (but without addressing the click 8.x issue)
• As far as I know, they have not responded to issues or PRs here in many, many months ([QUESTION] Is the project still maintained? #300)

It’s not clear if this project will be maintained in a sustainable way in the future or not.

[tiangolo]

I just released Typer 0.4.0, which is compatible with both Click 7 and Click 8. 🎉

Upgrading Typer would handle it.

[justindujardin]

@mborsetti can you confirm if you still have problems after the 0.4.0 release of typer?

Pathy uses a >=0.3.0,<1.0.0 range for typer, so hopefully we shouldn't need to update anything. 🤞

[mborsetti]

@justindujardin Thanks! No problems with Pathy, works like a charm. Really appreciate your meaningful contribution to reducing dependency gridlock!