feat(mat-timepicker): Add option template

[oOps1627]

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Feature Description

Currently, to change the label of an option, I have to override the entire list of options or implement a custom DateAdaptor. But that's not exactly what I need. I want to be able to provide a custom template for a label

Use Case

In my case, I want to add a duration to each option, which will be calculated based on a specific time. The custom template will allow me to easily change the label text and also apply different CSS styles for time and duration