refactor: remove useless utils

BREAKING CHANGE: removed polyfill for `elementsFromPoint` since `elementsFromPoint` is now supported by all major browsers.

Author: chintankavathia

projects/ngx-datatable/src/lib/events.ts

@@ -58,5 +58,4 @@ export * from './lib/utils/throttle';
 export * from './lib/utils/sort';
 export * from './lib/utils/row-height-cache';
 export * from './lib/utils/column-helper';
-export * from './lib/utils/elm-from-point';
 export * from './lib/utils/tree';