Add "invoke endpoint" command feature

[denismakogon]

As a user, I'd like to get annotation URL like fn invoke blah blah --invoke-annotation-only (don't blame me, haven't thought about better option) or anything that might be better to get an invoke annotation, so, I can wire that to OCI cURL.

In order to fit CLI framework there's a chance to add requested feature to a set of "get" commands:

fn inspect fn <app> <fn> --invoke-endpoint-only

or

fn get invoke-endpoint <app> <fn>

or

fn get annotation <app> <fn>

or whatever can be useful.

[abhirockzz]

Have you tried fn inspect fn --endpoint <app-name> <fn-name> ?

[denismakogon]

Okay, haven't seen that, thanks.