Introduce dedicated backup / restore functionality for Insight

Problem definition

Currently, there is no possibility to completely and consistently back up and restore Insight data specifically from Jira UI.
In an event of data disaster, possibilities to restore the data are to use Jira XML backup / restore and to use full native database backup / restore. However, this will also require downtime and will affect Jira's data as well.

Suggested Resolution

Introduce a dedicated Insight backup / restore utility, completely independent of Jira, that would enable users to create and restore Insight dataset while leaving Jira's data untouched.
The backup procedure would preserve consistency on the database level (unique IDs), similarly like Jira XML backup procedure does.