Get retrieves a value from a V2 proto at `path`, or returns a default value.

NewPath creates a Path from a string definition using proto field names.

Set sets the value of a proto at `path`.

ToJSONPath converts the `path` corresponding to the `proto` in to the JSON path, providing a cleaner way to return paths to users for debugging.

Zero represents the zero value of any type, it can be used in Set as the value argument to set the value at the path to its corresponding zero value, or Get as the default value, to return the zero value of the field being retrieved if the field is valid but not populated.

Path is a selector for a proto field.