Move GridFS to uploads package and resuse more code

lib/fileUpload.js

...ges/rocketchat-file-upload/client/lib/FileUploadGridFS.js

packages/rocketchat-file-upload/package.js

...hat-file-upload/server/config/configFileUploadAmazonS3.js

...t-file-upload/server/config/configFileUploadFileSystem.js

...ile-upload/server/config/configFileUploadGoogleStorage.js

...tchat-file-upload/server/config/configFileUploadGridFS.js

packages/rocketchat-file-upload/server/lib/FileUpload.js