Add autofix for "unused variable" #1460
Description
To start, we can just mimic autoflake, whose logic is relatively simple: https://github.com/PyCQA/autoflake/blob/60eeb31082bf5290341e84a008d5c832fb04fd13/autoflake.py#L664.
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To start, we can just mimic autoflake, whose logic is relatively simple: https://github.com/PyCQA/autoflake/blob/60eeb31082bf5290341e84a008d5c832fb04fd13/autoflake.py#L664.