fix(material/datepicker): fix date picker shortcuts

Fixes a bug in the Angular Material datepicker component where the datepicker should open/close only on alt+down and alt+up respectively but using shift + ctrl + alt + down or ctrl + alt + down the datepicker was opening, and same happens for closing the date picker added a condition to check if ctrl, shift or meta keys are present and if it is present restricting datepicker to not to open/close.

Fixes #25868

Author: sasidharansd

tools/public_api_guard/cdk/keycodes.md

@@ -190,6 +190,9 @@ export const MAC_WK_CMD_RIGHT = 93;
 // @public (undocumented)
 export const META = 91;
 
+// @public
+export type ModifierKey = 'altKey' | 'shiftKey' | 'ctrlKey' | 'metaKey';
+
 // @public (undocumented)
 export const MUTE = 173;