Make CLI optional?

[bollwyvl]

typer brings along rather a lot of dependencies. Might it be possible to make that dependency optional for using this as a library? One way would be a [cli] extra, or a whole separate package for jsf-cli.

[ghandic]

See #52

[bollwyvl]

In this same vein, 0.7.0 added requests as an undeclared, but still hard dependency (import jsf fails without).

Perhaps import requests could be moved inside those specific functions, which might not always get used, and a [requests] extra added.

Alternately:

• use the stdlib urllib.request.urlopen
• offer a "driver" pattern that allowed for selecting from e.g. a collection of local images
• allow the http implementation to be handed in as a configuration object

[bollwyvl]

Ah, i see it's coming along with smart_requests[http].