List Media Assets

List media assets, excluding those that have been deleted.
A media asset can be:

• A "recording" that is from the full duration of the stream
• A "clip" which is generated from Create Media Asset
• A "timeline" which is a series of segments that is buffered in a cache and available for clipping. A "timeline" is capped at a 12 hour duration or whenever the stream is re-started.
• Of type storageValidation, which is a record reflecting the outcome of triggering Validate Third Party Storage Setup