DO NOT deprecate @time-picker-open & @time-picker-close (overlay-toggle Is not a substitute)

[alexchexes]

I just wanted to point out that, despite the docs say that we should use @overlay-toggle instead of @time-picker-open and @time-picker-close, @overlay-toggle does not provide a way to determine whether we have completely exited time-picker mode (returning to the date-picker) or if we are still in time-picker mode but have only closed the hours/minutes overlay.

I mean, the @overlay-toggle callback reports the same data:
{ overlay: 'hours', open: false }
in both scenarios:

1. When we close the time-picker completely while in the hour-overlay.
2. When we simply close the hour overlay while still in time-picker mode.

In contrast, @time-picker-close is only triggered when we fully close the time-picker overlay, regardless of whether we were in the hours or minutes overlay.