Feature: check and fix saga execution process problem

[wt-better]

Saga is a distributed transaction processing mode used to ensure consistency in distributed systems.The state machine mode of saga implemented in seata java, it`s needs to be support in seata go.

Understand the execution process of the saga state machine, handle exceptions that affect the execution of the saga process, such as context timeout and error handle, and fix them.

[wt-better]

There has been one history implementation, corresponding to the branch: feature/saga, but the details need to be completed. you can develop on this branch.

[xjlgod]

please assign to me