Suggestion: Inso CLI should prompt the user if a plugin is missing

[Cirius1792]

When I try to run my test suite from inso cli I would like to be advised if one of the plugins used in my requests is missing.
The actual behaviour, instead, is that my requests using those plugins simply fail, for example with the message:
Error: Failed to render request: req_wrk_ff5a8f9619e941bc8e9f26d9cf6865d8f1f90e59

What do you think?

Yesterday I spent an hour trying to figure out why my script was failing when executed in the CI and eventually I remembered that I was using a new plugin 😅