support sub-shells?

when working in a particular area (e.g. kubernetes- / project- / jpa- or whatnot) all the command tend to be prefixed by "$area-" which can lead to a bit of extra typing when performing lots of related commands in a particular area.

To avoid typing the prefix a lot I wonder if we should support a kinda 'sub shell' thing where if a user is gonna be working for a while on an area (say project- or jpa-) they could just enter the sub shell / domain.

e.g.

[foo] $ list-facets
Command: list-facets was not found.
[foo] $ project-list-facest
...
[foo] $ project
now in the *project* sub shell. Type 'exit' to leave
[foo:project] $ list-facets
...
[foo:project] $ exit
[foo] $ list-facets
Command: list-facets was not found.