Alias sources Cassandra projection consistency

Implement inconsistency in listSources Cassandra DAO:

Implement a task that deletes all mapping sources from the DAO then re run the migration task.
Expose this as a webadmin end-point (in a new `/server/protocols/webadmin/webadmin-cassandra-data` mvn module):

curl -XPOST /cassandra/mappings?action=solveInconsistencies

Will return a taskId

Write unit test for this new route & bind it in cassandra-guice bindings.