chore: internal import updates to improve bundling (#21400)

* chore: internal import updates to improve bundling

- Rename keyboard.ts so it has a good filename after custom element bundling
- Import util fns directly instead of from top level index
- Do not export with *

* chore(angular): bump ng-packagr

Co-authored-by: Mike Hartington <mikehartington@gmail.com>

core/src/utils/animation/animation-utils.ts

@@ -1,5 +1,7 @@
 import { AnimationKeyFrames } from './animation-interface';
 
+let animationPrefix: string | undefined;
+
 /**
  * Web Animations requires hyphenated CSS properties
  * to be written in camelCase when animating
@@ -33,8 +35,6 @@ const convertCamelCaseToHypen = (str: string) => {
   return str.replace(/([a-z0-9])([A-Z])/g, '$1-$2').toLowerCase();
 };
 
-let animationPrefix: string | undefined;
-
 export const getAnimationPrefix = (el: HTMLElement): string => {
   if (animationPrefix === undefined) {
     const supportsUnprefixed = (el.style as any).animationName !== undefined;