mat-select: Possibility to set typing debounceInterval

[keatkeat87]

the current debounceInterval is 200ms, it is too fast for user and it is not work like native select search.

use-case :
user select address zip code, and typing to search like e.g. 81300
the use have to typing very quickly. if user typing 81 and delay more than 200ms
then the search could not be continue.

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