Fix/minedojo

[michele-milesi]

Summary

Describe the purpose of the pull request, including:

• Fix minedojo wrapper: removed / from the name of the observations to a correct creation of the memmap files when memmap buffer is used.
• Moved exploratory action from Player to MinedojoActor for dreamer-based algorithms. In this way, the player is general and can be used with all the environments. Instead, for using an environment that needs to mask actions, the user has to define a custom actor (as the MinedojoActor).
• In Dreamer-like algorithms, now, the Actor defines the add_exploration_noise method that takes in input the actions and adds to them some noise.
• In Dreamer-like algorithms, the exploration configs now must be defined under the algo.actor key, not under the algo.player one.

Type of Change

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• Bug fix (non-breaking change that solves an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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