Fix bug in learning experiences logging

[csmangum]

Related to #49

Fix the issue of LearningExperiences table not being populated with data.

• actions/base_dqn.py

  • Call log_learning_experience within the store_experience method to log individual experiences.
  • Ensure cleanup method calls batch_log_learning_experiences to log pending experiences.

• environment.py

  • Call cleanup method of each agent's DQN modules within the update method to log learning experiences.

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