Update wandb.py to accept setting run name from command line argument (e.g., --wandb_config.name "run_name") for fine tuning

[ryf1123]

What does this PR do?

Current wandb logging generate a random run name (despite wandb supporting assigning a run name); I added a missing name attribute to wandb_config, so one could use command line argument like this --wandb_config.name "run_name" to control the displayed run_name on the wandb webpage.

Feature/Issue validation/testing

Before and after the change of this commit, and use argument --wandb_config.name "fake run name". Note that stoic-eon-2 is a random name.

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[IgorKasianenko]

Thank you very much for the fix!

[IgorKasianenko]

@ryf1123 Please review and accept Contributor License Agreement at https://code.facebook.com/cla so I will be able to merge this