Release 0.3.8

Features:

• Added the basic implementation of the first version of positive diagnostics.
• Supported 'fast-fail' strategy for training job in some boundary scenarios. e.g. pending case
• Accelerate(sync -> async) pod creation.
• Added the basic implementation of structured event logging.

BugFix:

• Fixed unexpected rendezvous failure in occasional fault-tolerant scenarios.
• Fixed unexpected socket client creation before socket socket creation.
• Optimized 'network-check' implementation for 'Ascend NPU'.
• Optimized some implementations for master-fault-tolerance(internal) scenario.
• Other numerous known issues fixed and optimized.