[Model] Support to train glm5

[heavyrain-lzy]

PR Category

Train

PR Types

Others

PR Description

• Add GLM5 training support with new example configs under examples/glm5/, including both a small demo config and a 744B/40B Active model config.
• Add GLM5 checkpoint conversion support in tools/checkpoint/, but not verified enoughly.
• Update Megatron GPT builder to preserve experimental attention layer specs for MTP and print model structure/basic parameter-memory information after model construction.
• Fix checkpoint save flow so energy monitor pause/resume is only triggered when log_energy is enabled.