Refactor fabric-cqrs and Gatewaylib, to using newly added Redis and Query-Handler

[rtang03]

For the sake of ease development, follow below step.

1. complete issue-20, which includes the all implementation of Redis-based querydb, and projection db, and their event-notification. And, Redisearch as well.
2. after (1) is done, the "query-handler" will be able to reconcile, subscribeHub, and notify events. This step 2, will further refactor, the "query-handler", to relocate duplicated implementation, BACK to "fabric-cqrs" and "gateway-lib".
3. the query-handler will be trimmed down, and made to "query-handler" docker image.

[rtang03]

#20 is done. Now starts this task.