Display durations for hooks

[blueyed]

Using pre-commit often takes 5+s, which is kind of a bummer for gcma ("git commit --amend" "$@" ).

Therefore I'd like to be aware/notified about the slowest hooks, to potentially improve/remove them then.

It would be nice if pre-commit would display durations by default already - given that each hook takes a line of terminal output already it should be ok to add it there.

For reference: I am dispaying total durations already with 77aab5e ("quiet by default").

[asottile]

Dupe #1144