S2Meta: Added conversion methods from proto and DataProvider (#341)
S2Meta: Added conversion methods from proto and DataProvider (#341)

* added conversion methods

* review changes

* removed nesting

* clean up comments

* removing nits

* removed yarn.lock

cartographer-project/point_cloud_viewer,cartographer-project/point_cloud_viewer,cartographer-project/point_cloud_viewer,cartographer-project/point_cloud_viewer,googlecartographer/point_cloud_viewer,cartographer-project/point_cloud_viewer,googlecartographer/point_cloud_viewer,googlecartographer/point_cloud_viewer,googlecartographer/point_cloud_viewer,googlecartographer/point_cloud_viewer