[Feature] add MiniCluster as integration test environment

[HJ-Young]

Feature Description

The current HugeGraph lacks an integrated testing environment, and DB testing requires manually setting up a cluster locally. To provide a more convenient and standardized testing environment, and also to facilitate the smooth implementation of subsequent testing plans, an integrated testing framework will be added to HG, namely a simple cluster environment MiniCluster. MiniCluster will offer two testing modes: SimpleMode and MultiMode, corresponding to the simplest single-node cluster mode and the multi-node cluster mode, respectively.

TODO:

• Based on the current system design of HG, implement the cluster design from the source code;
• Write related unit test cases for MiniCluster;
• Incorporate MiniCluster testing into the CI process of Github Action.