Add react-dnd-touch-backend types (#20770)

* Add react-dnd-touch-backend types

* CS fixes

* Add dom lib

types/react-dnd-touch-backend/index.d.ts

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+// Type definitions for react-dnd-touch-backend 0.3
+// Project: https://github.com/yahoo/react-dnd-touch-backend#readme
+// Definitions by: Daniel Król <https://github.com/mleko>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import * as ReactDnd from "react-dnd";
+
+export default function createTouchBackend(options: TouchBackendOptions): ReactDnd.Backend;
+
+export interface TouchBackendOptions {
+    enableMouseEvents?: boolean;
+}

types/react-dnd-touch-backend/react-dnd-touch-backend-tests.ts

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+import * as ReactDnd from "react-dnd";
+import TouchBackend from "react-dnd-touch-backend";
+
+const component = () => null;
+
+const dndComponent = ReactDnd.DragDropContext(TouchBackend)(component);
+const dndComponentMouseEvents = ReactDnd.DragDropContext(TouchBackend({enableMouseEvents: true}))(component);

types/react-dnd-touch-backend/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-dnd-touch-backend-tests.ts"
+    ]
+}

types/react-dnd-touch-backend/tslint.json

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+{ "extends": "dtslint/dt.json" }