Using QueueMetadata fields to represent different data and types

[plameniv]

We are using QueueMetadata.VisibilityTimeout to pass in the number of seconds for the visibility timeout and to return the timeNextVisible date in the format of "Tue, 21 Apr 2020 16:33:23 GMT"

Similarly we are using QueueMetadata.TimeToLive to pass in the number of seconds for a message’s time to live and to return the expirationTime date in the format of "Tue, 21 Apr 2020 16:33:23 GMT"

We should instead add QueueMetadata.TimeNextVisible and QueueMetadata.ExpirationTime.

This can potentially break downstream users if they use the current metadata to access timeNextVisible and expirationTime.