Add migrations for different versions of the query settings

[stolpeo]

Is your feature request related to a problem? Please describe.
Follow up ticket for #1629. After introducing the versioning for the query settings, we need to implement a migration code for different versions of the query settings. More specifically if the change introduce would break the query, we increase the major version number. We then need to convert the old settings to the new one if the major versions differ when a user submits a query (or sth similar).

[xiamaz]

After discussion, migration is optional and probably a bit complex. What we definitely need is that versions will be checked and stored settings need to be deleted if the versions don't match. @stolpeo Could you please create a new ticket for that requirement?

[stolpeo]

Follow-up ticket created: #1807

[stolpeo]

Moving ticket back to backlog