Add pre-commit config and "apply" it - no trailing spaces, sorted imports

[yarikoptic]

Also removed duplicate .codespellrc since now we specify in pyproject.toml

Inspired by seeing all trailing spaces deleted by @mslw in

• Partial fix for predicting Docker 27 image IDs from older images #270

[codeclimate]

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[yarikoptic]

appveyor -- seems overall in a bad shape

[ "x$PY" != x ] && . ${HOME}/venv${PY}/bin/activate || python3 -m venv ${HOME}/dlvenv && . ${HOME}/dlvenv/bin/activate; ln -s "$VIRTUAL_ENV" "${HOME}/VENV"
The virtual environment was not created successfully because ensurepip is not
available.  On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.
    apt install python3.8-venv
You may need to use sudo with that command.  After installing the python3-venv
package, recreate your virtual environment.
Failing command: ['/home/appveyor/dlvenv/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']
ln: failed to create symbolic link '/home/appveyor/VENV' -> '': No such file or directory
Command exited with code 1
Running "on_finish" scripts
while [ -f ~/BLOCK ]; do sleep 5; done
Build failed

should be fixed separately. I do not expect breakages but apparently we do not have any unittesting going on without this appveyor thing... heh, will look into fixing here, but in the longer run I think we need to centralize such testing, filed

• Centralize management of CI for extensions from this repo datalad-extensions#132