Add run_name argument support for wandb integration

[firefighter-eric]

Describe the feature

Currently, the swift framework supports logging to Weights & Biases (wandb), but does not provide a CLI option to set a custom run name, like transformers does via the run_name parameter in TrainingArguments.

This makes it harder to organize and distinguish experiments in the W&B dashboard, especially when running multiple jobs via command line scripts.

Requested change

Add a new CLI argument:

–run_name 

Additional context

• Reference: transformers.TrainingArguments.run_name
• Example CLI usage in swift (after implementation):

swift sft --model qwen --run_name "exp_lr5e4_bs2" --other_args ...