azure images list is missing a created_at timestamp in output

[eyberg]

[eyberg]

surprisingly this is not readily available from the image struct or any of it's subsets however it is available through the activity log https://docs.microsoft.com/en-us/answers/questions/9006/how-can-i-determine-what-date-a-vm-image-was-creat.html

[eyberg]

https://github.com/nanovms/ops/pull/1382