fixes a major logging bug for val in 1.0

Fixes the last major bugs for validation logging.
Also removes duplicate charts for metric / metric_loss.
Doing this minor release because correct validation metrics logging is critical.

Details changes

Added

• Added trace functionality to the function to_torchscript (#4142)

Changed

• Called on_load_checkpoint before loading state_dict (#4057)

Removed

• Removed duplicate metric vs step log for train loop (#4173)

Fixed

• Fixed the self.log problem in validation_step() (#4169)
• Fixed hparams saving - save the state when save_hyperparameters() is called [in __init__] (#4163)
• Fixed runtime failure while exporting hparams to yaml (#4158)

Contributors

@Borda, @NumesSanguis, @rohitgr7, @williamFalcon

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