* Basic wandb support
* refactor(wandb): remove unused variables and document logger
* docs(wandb): explain how to use WandbLogger
* test(wandb): add tests for WandbLogger
* feat(wandb): add save_dir
* fix(wandb): allow pickle of logger
* fix(wandb): save logs in custom directory
* test(wandb): test import
* docs(wandb): simplify docstring and use doctest
* test: increase number of epochs for satisfactory accuracy
* test(test_load_model_from_checkpoint): ensure we load last checkpoint
Co-authored-by: Chris Van Pelt <vanpelt@wandb.com>
Co-authored-by: William Falcon <waf2107@columbia.edu>
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