We need a unit test environment to mock multiple domains

## Enhancement
Pseudo-distributed testing is performed by simulating multiple computing instances in unit test.
1. Simulate multiple nodes to quickly verify the overall function of the dist task framework in the unit test phase, focusing on the simplest subtask execution.
2. Simulate the addition and reduction of node functions in the unit test.
3. In the unit test, error injection is carried out on the distributed framework, and the crash safe of scheduling is paid attention to.