Custom time renderer similar to `renderDayContents`
Is your feature request related to a problem? Please describe.
Currently rendering a custom day in the calendar widget is supported by renderDayContents. It is particularly useful when e.g. showing tooltips explaining why a certain date is disabled. However, I do not see that anything similar to this is supported for the time pickers. I believe we can add a renderTimeContents prop that does basically the same but for a time picker.

Describe the solution you'd like
Additional prop renderTimeContents which work exactly the same as renderDayContents but for a time picker.
Additional context I could create a Pull Request for that if needed
^+1
+1
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