ENH: Add GitHub Actions workflow for running "pre-commit"

[jcfr]

This pull-request adds workflow leveraging pre-commit, a framework for managing and maintaining pre-commit hooks.

[!IMPORTANT] For now, this will only report info to developers after the PR is submitted. There are no changes in the hook setup locally yet.

See https://pre-commit.com/ and https://github.com/pre-commit/action

Running the pre-commit locally can be done using the following command:

pre-commit run --all-files

The hooks enabled in the "pre-commit-config.yaml" configuration file are:

• check-added-large-files Prevent giant files from being committed.

  Set the size to 1024 to match the value hard-coded in https://github.com/Slicer/Slicer/blob/hooks/pre-commit#L125

• check-case-conflict Check for files with names that would conflict on a case-insensitive filesystem like MacOS HFS+ or Windows FAT.

• check-merge-conflict Check for files that contain merge conflict strings.

• check-symlinks Checks for symlinks which do not point to anything.

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To allow a gradual improvement of the code base while carefully reviewing each changes, exceptions for all issues reported by locally running the following command are listed in .flake8 configuration files:

  pre-commit run --all-files

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It is based from similar updates integrated in Slicer through https://github.com/Slicer/Slicer/pull/6262 themselves adapted from prior work done by @henryiii in https://github.com/scikit-build/scikit-build and https://scikit-hep.org/developer/style