Autocomplete: expose option activated event

[ahnpnl]

Feature Description

At the moment, mat-autocomplete only exposes optionSelected event which is fired when users choose an option in the autocomplete list. However, if users want to listen to option activated, there is no public API for that.

Option activated means users go through the list of options in autocomplete list by keyboard event. At this point, mat-option is marked as active. I've checked mat-option APIs but there is no public API for that either.

Use Case

I have a use case that I have an autocomplete input field which performs live search for data. This autocomplete field is similar to google search input field. When users go through the list of autocomplete options by arrow down/arrow up, the activated option is displayed on the input field. By listening to option activated event, I can display the activated option in the input field

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