Add capability to log on a step-based interval in OffPolicyAlgorithm

[tobiabir]

Description

• Removed log_interval argument from collect_rollouts in OffPolicyAlgorithm
• Added logging in learn of OffPolicyAlgorithm instead
• Fixed documentation of the functionality of log_interval
• Swapped logging and training in learn for both OffPolicyAlgorithm and OnPolicyAlgorithm
• Updated default values for log_interval for off-policy algorithms
• Updated changelog

Motivation and Context

• I have raised an issue to propose this change (required for new features and bug fixes)
  Closes [Feature Request] Add capability to log on a step-based interval in OffPolicyAlgorithm #1708

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)

Checklist

• I've read the CONTRIBUTION guide (required)
• I have updated the changelog accordingly (required).
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.
• I have opened an associated PR on the SB3-Contrib repository (if necessary)
• I have opened an associated PR on the RL-Zoo3 repository (if necessary)
• I have reformatted the code using make format (required)
• I have checked the codestyle using make check-codestyle and make lint (required)
• I have ensured make pytest and make type both pass. (required)
• I have checked that the documentation builds using make doc (required)

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