[paginator] coerce boolean inputs

[willshowell]

Bug, feature request, or proposal:

Bug

Expected behavior

hidePageSize and the upcoming showFirstLastButtons (#9603) should coerce their values.

<mat-paginator hidePageSize showFirstLastButtons>...</mat-paginator>

Current behavior

It is necessary to explicitly declare the boolean values: [hidePageSize]="true"

Motivation

Consistency with other component inputs

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