Enforce event_id being read as np.ndarray and event_name as list in Hazard readers. #950
Description
Related to #910
In addition to checking that elements of event_name are strings when reading/writing, @chahank suggested to enforce the type for the container for both event_name and event_id (As the former expects a list and the latter an ndarray.
As it is closely related to the checks added to address #910, we should also cover this issue.
See related PR for more details.