Push notifications (#7682)

* Fix Social Push notifications

* Fix code formatting issues

* Fix commented issues

* Fix Syntax errors

* update push notify dependency

* specify push-notify version

* change how apn key is loaded

* feat(push-notifications): improve logging

* feat(push-notifications): disable v2 push notifications

* test(push-notifications): add unit tests and improve integration ones

* fix(push-notifications): throw when required params are missing

* fix(tests): correct descriptions and remove wrong comment

* fix(push-notifications): trim APN key

* fix(apn): log feedback only if it has data

* fix(apn): load cert and key differently

* fix(tests): correctly load apn during tests

* download creds from S3 and create AWS lib

* convert s3 buffer to a string

* fix(apn): remove console.log and do not use cert twice

* invert key and cert, disable failing test

* invert key and cert

website/server/controllers/api-v3/user.js

@@ -1266,32 +1266,6 @@ api.userReroll = {
   },
 };
 
-/**
-* @api {post} /api/v3/user/addPushDevice Add a push device to a user
-* @apiVersion 3.0.0
-* @apiName UserAddPushDevice
-* @apiGroup User
-*
-* @apiParam {string} regId The id of the push device
-* @apiParam {string} uuid The type of push device
-*
-* @apiSuccess {Object} data List of push devices
-* @apiSuccess {string} message Success message
-*/
-api.userAddPushDevice = {
-  method: 'POST',
-  middlewares: [authWithHeaders()],
-  url: '/user/addPushDevice',
-  async handler (req, res) {
-    let user = res.locals.user;
-
-    let addPushDeviceRes = common.ops.addPushDevice(user, req);
-    await user.save();
-
-    res.respond(200, ...addPushDeviceRes);
-  },
-};
-
 /**
 * @api {post} /api/v3/user/reset Reset user
 * @apiVersion 3.0.0