Remove SyncedResourceEntity from database.

[aditya-07]

Describe the Issue

Since the way resources are downloaded depends on the developer application, and last update & resource type might not hold the same relationship is some cases (as it does for simple search dfs download), we should get rid of the SyncedResourceEntity.
The onus would be on the developer application to save the required meta data( to make efficient search) and use it wherever applicable.
Would you like to work on the issue?