Storage/blob storage functionality

[boonwj]

This PR adds hologram creation, deletion and download functionality from the azure blob storage.

[nielsboecker]

• Confirmed POST /hologram, GET the new hologram, GET download the new hologram, and DELETE it
• Confirmed that the downloaded GLB file is identical to the inital upload
• Confirmed that the performance is feasible (~250 ms for 120kb file)
• Confirmed that the Postman exported JSON collection can be used on my end
  • A note on that: I think this is extremely helpful and we should keep it around. We could just add the link you gave me to the README, but I think I'd prefer to check in the JSON with the repository, and mention in the README that it can be imported into Postman.
  • Another note: For one endpoint (I think it was the deletion) the hid was hardcoded instead of the nice placeholder text there was for other hologram endpoint IDs