Include contrib folder and pytorch stringifier

[georgepar]

This PR introduces a new contrib folder under pudb for community customization. A stringifier for pytorch is included. Related issue: #475

Detailed changelog:

• A module was added under pudb/contrib/stringifiers as place to store custom stringifiers.
• A stringifier for pytorch tensors and modules is included.
• An option was added in the settings menu for the user to enable or disable the cotrib content for users that want to stick to the core pudb installation.
• Changes were made in var_view.py and settings.py to allow for inclusion of the contrib/stringifiers in the configuration menu.

Signed-off-by: Giorgos Paraskevopoulos [email protected]

[inducer]

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