Add context to temporarily enable/disable showing stream data in consoles

[MHendricks]

• The preditor.contexts.OverrideConsoleStreams context manager can enable or disable echoing tracebacks, stdout, stderr, results for consoles.
• You can now define a default logging formatter for a Console instead of having to define it for each entry in logging_handlers. You can still define formatter's for specific logging_handlers.

Checklist

• I have read the CONTRIBUTING.md document
• I formatted my changes with black
• I linted my changes with flake8
• I have added documentation regarding my changes where necessary
• Any pre-existing tests continue to pass
• Additional tests were made covering my changes

Types of Changes

• Bugfix (change that fixes an issue)
• New Feature (change that adds functionality)
• Documentation Update (if none of the other choices apply)