Easier access to configuration values

[remyleone]

Let's suppose that I want to get the region of my current configuration. Just the string of the region.
At the moment I can have it using:

scw config get default_region -o json | jq -r ".[0].value"

I would like to have something easier to use

Description

scw config get region

How I imagine scw could expose this functionality

scw config get region

This one is shorter than default_region
And more generally have shorter commands to get to the values.
Having direct output as a string and not a table with the value could be useful

References

[jerome-quere]

duplicate of #948