Add: Asset FDB and merged bucket type

Merged Akshay Bharambe requested to merge Add_AssetFDB into devbranch
  1. Add: Asset fdb with Save and Get Media operations.
  2. Add: Mixed bucket type to hold JSON as well as media.
  3. Fix: Required Error type not set in case of the delete operation.
  4. Fix: Error while updating data which is not present.
Edited by Akshay Bharambe

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