Fix/type dateadapter override (#8377)

* Not totally sure this is right , but since in core.adapters.js override is part of the dateadapter it seems logical it should be there. Should also fix #8369
* implemented feedback
* Declare the dataAdapter since it will be available at runtime if someone overrides it
* remove declaration. if this is giving problems in the future it might need te be added again

Author: LeeLenaleee

types/adapters.d.ts

@@ -1,6 +1,10 @@
 export type TimeUnit = 'millisecond' | 'second' | 'minute' | 'hour' | 'day' | 'week' | 'month' | 'quarter' | 'year';
 
-export interface DateAdapterBase {
+export interface DateAdapter {
+	// Override one or multiple of the methods to adjust to the logic of the current date library.
+	override(members: Partial<DateAdapter>): void;
+	readonly options: any;
+
 	/**
 	 * Returns a map of time formats for the supported formatting units defined
 	 * in Unit as well as 'datetime' representing a detailed date/time string.
@@ -54,16 +58,6 @@ export interface DateAdapterBase {
 	endOf(timestamp: number, unit: TimeUnit | 'isoWeek'): number;
 }
 
-export interface DateAdapter extends DateAdapterBase {
-	readonly options: any;
-}
-
-export const DateAdapter: {
-	prototype: DateAdapter;
-	new(options: any): DateAdapter;
-	override(members: Partial<DateAdapter>): void;
-};
-
 export const _adapters: {
 	_date: DateAdapter;
 };

types/index.esm.d.ts

@@ -24,7 +24,7 @@ import {
 	ScriptableAndArrayOptions
 } from './scriptable';
 
-export { DateAdapterBase, DateAdapter, TimeUnit, _adapters } from './adapters';
+export { DateAdapter, TimeUnit, _adapters } from './adapters';
 export { Animation, Animations, Animator, AnimationEvent } from './animation';
 export { Color } from './color';
 export { Element } from './element';