[vscode] remove duplicate declaration for DocumentDropEdit and add stub to documentation

fixes #15123

contributed on behalf of STMicroelectronics

Author: rschnekenbu

packages/plugin/src/theia.d.ts

@@ -14528,6 +14528,7 @@ export module '@theia/plugin' {
          *
          * @returns The resolved edit or a thenable that resolves to such. It is OK to return the given
          * `edit`. If no result is returned, the given `edit` is used.
+         * @stubbed
          */
         resolveDocumentDropEdit?(edit: T, token: CancellationToken): ProviderResult<T>;
     }
@@ -14728,48 +14729,6 @@ export module '@theia/plugin' {
      */
     export type CharacterPair = [string, string];
 
-    /**
-     * An edit operation applied {@link DocumentDropEditProvider on drop}.
-     */
-    export class DocumentDropEdit {
-        /**
-         * The text or snippet to insert at the drop location.
-         */
-        insertText: string | SnippetString;
-
-        /**
-         * An optional additional edit to apply on drop.
-         */
-        additionalEdit?: WorkspaceEdit;
-
-        /**
-         * @param insertText The text or snippet to insert at the drop location.
-         */
-        constructor(insertText: string | SnippetString);
-    }
-
-    /**
-     * Provider which handles dropping of resources into a text editor.
-     *
-     * This allows users to drag and drop resources (including resources from external apps) into the editor. While dragging
-     * and dropping files, users can hold down `shift` to drop the file into the editor instead of opening it.
-     * Requires `editor.dropIntoEditor.enabled` to be on.
-     */
-    export interface DocumentDropEditProvider {
-        /**
-         * Provide edits which inserts the content being dragged and dropped into the document.
-         *
-         * @param document The document in which the drop occurred.
-         * @param position The position in the document where the drop occurred.
-         * @param dataTransfer A {@link DataTransfer} object that holds data about what is being dragged and dropped.
-         * @param token A cancellation token.
-         *
-         * @return A {@link DocumentDropEdit} or a thenable that resolves to such. The lack of a result can be
-         * signaled by returning `undefined` or `null`.
-         */
-        provideDocumentDropEdits(document: TextDocument, position: Position, dataTransfer: DataTransfer, token: CancellationToken): ProviderResult<DocumentDropEdit>;
-    }
-
     /**
      * Represents a session of a currently logged in user.
      */