Also add specs and update GraphQL schema

Make EpicsFinder able to search for epics which
start with a partial iid

Constructs a combined where clause which includes all possible
combinations for the given iid start string which would take advantage
of the existing index on epics table.

Use LIKE query for iid search with specialized index

Add index for searching epics by iid and group_id

Remove obsolete scopes and specs

Change changelog entry