CacheFactory and related interfaces for Hazelcast IMDG

[cj-chung]

Objective: Implement a CacheFactory class and related classes using HazelCast IMDG under com.futuerwei.alcor.common.db.hazelcast.

Work Items:

1. Study package com.futurewei.alcor.common.db.ignite and com.futurewei.alcor.common.db.redis
2. Implement cache and related classes using hazelcast's IMap:

• HazelcastCache.java
• HazelcastDbCache.java
• HazelcastConfiguration.java
• HazelcastCacheFactory.java

3. Implement Transaction features for HazelcastCache.
4. Implement Distributed Lock features for HazelcastCache.

References:

• https://docs.hazelcast.org/docs/4.1-BETA-1/manual/html-single/index.html
• https://github.com/hazelcast/hazelcast-code-samples