[@types/slate] Support nested plugin stacks on the "plugins" c… (#36349)

* fix: editor takes a recursively nested plugin stack as contructor argument

* chore: formatting

* refactor: remove obsolete list type. naming

* fix: enforce a list as root data type.

* Update index.d.ts

types/slate/index.d.ts

@@ -1131,9 +1131,11 @@ export interface Plugin {
     schema?: SchemaProperties;
 }
 
+export interface Plugins extends Array<Plugin | Plugins> {}
+
 export interface EditorProperties {
-    onChange?: (change: { operations: Immutable.List<Operation>, value: Value }) => void;
-    plugins?: Plugin[];
+    onChange?: (change: { operations: Immutable.List<Operation>; value: Value }) => void;
+    plugins?: Plugins;
     readOnly?: boolean;
     value?: Value;
 }

types/slate/slate-tests.ts

@@ -114,7 +114,7 @@ const plugin: Plugin = {
     schema: {...schema},
 };
 
-const plugins = [plugin];
+const plugins = [plugin, [plugin, [plugin]]];
 
 const editor = new Editor({ value, plugins });
 const point = Point.create({ key: "a", offset: 0 });