Use eslint-plugin-prettier recommended config (#25674)

Summary:
I created a new test project today using RN 0.60.3 and saw that prettier is now used with eslint. After looking at the `react-native-community` eslint config, I notice that it wasn't using the [recommended configuration](https://github.com/prettier/eslint-plugin-prettier#recommended-configuration) of `eslint-plugin-prettier`

This PR adds the `eslint-config-prettier` to avoid conflicts between eslint and prettier, it also adds the `prettier/react` config to avoid problems with the `eslint-plugin-react`.

## Changelog

[General] [Changed] - Use eslint-plugin-prettier recommended config
Pull Request resolved: https://github.com/facebook/react-native/pull/25674

Test Plan: - ✅ Ensure there is no difference on this repo (no ESLint errors, same number of warnings, and no changes when running prettier).

Differential Revision: D16666178

Pulled By: cpojer

fbshipit-source-id: 70f81db793866acc88388b7b00a496aab5e0b156

package.json

@@ -127,6 +127,7 @@
     "eslint": "5.1.0",
     "eslint-config-fb-strict": "24.3.0",
     "eslint-config-fbjs": "2.1.0",
+    "eslint-config-prettier": "^6.0.0",
     "eslint-plugin-babel": "^5.3.0",
     "eslint-plugin-eslint-comments": "^3.1.1",
     "eslint-plugin-flowtype": "2.50.3",