Add duration and cache source to fmt/lint/check output.

[asherf]

Similar to how this was implemented for tests: #13889
I think we should have it for other goals, for the pants project, I think it is a huge flex to show that it didn't need to run a specific task since the input didn't change.

[stuhood]

Possibly! One bit of complexity here is just that the "scope" of fmt/lint/check is still being discussed and will likely be adjusted in #13462 and others. So "how many files were checked/formatted/linted and in how many processes" isn't always as clear as it is for tests (where it is always "a target in one process": usually a single file).

[thejcannon]

+1 to the duration. I'm seeing pylint being a particular tentpole in my repo but I couldn't give you more specific timings without some clever wiring.