Update globals.d.ts for File declaration in Typescript (#38165)

Summary:
In Webstorm or VSCode when using Typescript the declaration of the class "File" is missing. So both IDEs show "File" as error. With this change it fixes the issue https://github.com/facebook/react-native/issues/38061 .

## Changelog:
[GENERAL] [FIXED] Fixed missing File declaration in Typescript global.d.ts
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Pull Request resolved: https://github.com/facebook/react-native/pull/38165

Test Plan:
I ran
`yarn run test-typescript`
with no error

After that i initialized a new react-native project and installed the react-native library with my local changes of global.d.ts. Webstorm and VSCode now find the declaration of "File" and don't show "File" as error and suggest the right parameters.

Reviewed By: rshest

Differential Revision: D47209461

Pulled By: cortinico

fbshipit-source-id: 0884dfe786ea3a5070aa0a487a8e74463c8f1a0f

packages/react-native/types/modules/globals.d.ts

@@ -80,6 +80,20 @@ declare var Blob: {
   new (blobParts?: Array<Blob | string>, options?: BlobOptions): Blob;
 };
 
+interface File extends Blob {
+  name: string;
+  lastModified: number;
+}
+
+declare var File: {
+  prototype: File;
+  new (
+    fileParts?: Array<Blob | string>,
+    name?: string,
+    options?: BlobOptions,
+  ): File;
+};
+
 type FormDataValue =
   | string
   | {name?: string | undefined; type?: string | undefined; uri: string};