Add Class Name to Card Header, Text and Actions (#15614)

Add `className` property to missing props interfaces. Ref #10823

types/material-ui/index.d.ts

@@ -784,6 +784,7 @@ declare namespace __MaterialUI {
             expandable?: boolean;
             showExpandableButton?: boolean;
             style?: React.CSSProperties;
+            className?: string;
         }
         export class CardActions extends React.Component<CardActionsProps, {}> {
         }
@@ -809,6 +810,7 @@ declare namespace __MaterialUI {
             title?: React.ReactNode;
             titleColor?: string;
             titleStyle?: React.CSSProperties;
+            className?: string;
         }
         export class CardHeader extends React.Component<CardHeaderProps, {}> {
         }
@@ -831,6 +833,7 @@ declare namespace __MaterialUI {
             color?: string;
             expandable?: boolean;
             style?: React.CSSProperties;
+            className?: string;
         }
         export class CardText extends React.Component<CardTextProps, {}> {
         }