Add BlobModule native module mock to jest setup

Summary:
React Native v0.48.0 shipped `WebSocketModule` support with `BlobModule` as dependency. But `BlobModule` is not mocked in jest which will cause render tests failed.

Reference implantation: [BlobModule.java](https://github.com/facebook/react-native/blob/ed903099b42259958d8a6eb3af1a6460c1bc8b2c/ReactAndroid/src/main/java/com/facebook/react/modules/blob/BlobModule.java)

Related PR: facebook#11417
Related issue: facebook#15810

Passed CI tests.
Need render a component in jest with WebSocketModule as dependency.
Closes facebook#15843

Differential Revision: D5783263

Pulled By: shergin

fbshipit-source-id: 2386692f4a644796da2fd66b3135da9f5911663e

jest/setup.js

@@ -237,6 +237,15 @@ const mockNativeModules = {
       Constants: {},
     },
   },
+  BlobModule: {
+    BLOB_URI_SCHEME: 'content',
+    BLOB_URI_HOST: null,
+    enableBlobSupport: jest.fn(),
+    disableBlobSupport: jest.fn(),
+    createFromParts: jest.fn(),
+    sendBlob: jest.fn(),
+    release: jest.fn(),
+  },
   WebSocketModule: {
     connect: jest.fn(),
     send: jest.fn(),