(v3.5.4) - WandBLogger: Possibility to not register incomplete episodes

[AlejandroCN7]

Description

This PR adds a new argument to the WandBLogger wrapper. This allows you to specify the minimum percentage of an episode that must be complete for the metrics summarizing the episode to be recorded under the episode_summaries tab.

By default, it records episodes that are 90% complete or more, but this threshold can be adjusted when instantiating the wrapper if desired. This prevents the recording of accidental empty episodes (see the related issue).

This update also includes minor fixes related to the calculation of the number of steps per episode and SB3 native logger writter. For more information, please check the changelog.

Motivation and Context

• I have raised an issue to propose this change (required for new features and bug fixes)

Fixes #431

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Improvement (of an existing feature)
• Others

Checklist:

• I've read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests.
• I have updated the documentation accordingly.
• I have reformatted the code using autopep8 second level aggressive.
• I have reformatted the code using isort.
• I have ensured cd docs && make spelling && make html pass (required if documentation has been updated.)
• I have ensured pytest tests/ -vv pass. (required).
• I have ensured pytype -d import-error sinergym/ pass. (required)

Changelog:

• Timesteps: reset call is not considered a timestep. Fixinf LoggerWrappers with this.
• BaseLoggerWrapper: Delete commented code about reset log.
• Callbacks: Eval freq with -1 to avoid SB3 automatic reset() before evaluation.
• NativeSb3 logger: wandb.log call with its own metric.
• Documentation: Added episode percentage constraint to the WandB documentation.