Killing the last inconsistencies through type hints

[hugsy]

Description

This PR is purely esthetic but fixes a few extra inconsistencies thanks to type hints, using pylint and pylance.
Both pass now reporting no error, warning or info!

Among other fixes:

• removed unused vars
• f-string-ify more
• enforce (using assert) expected type to variable when appropriate
• fixed some bad type names in gdb.events.*
• the config manager allows to receive non basic types
• applied all the type issues spotted by pylance using the gdb.pyi stub
• a lot of staticmethod have been made non static because we can use gef.gdb.commands["XXX"] instead

With this PR :

• pylint on gef and tests/*.py shows a 10/10 score

• pylance shows no error

Checklist

• My code follows the code style of this project.
• My change includes a change to the documentation, if required.
• If my change adds new code, adequate tests have been added.
• I have read and agree to the CONTRIBUTING document.

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🤖 Coverage update for 1c3504e 🔴

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