feat(tool): Add structured commits validation
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Adds stand-alone python script for validating structured commits
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Adds stand-alone python script for validating all branch commits
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Adds tests
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Adds .pre-commit-config.yaml for local dev validation
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Adds README and CONTRIBUTING files with minimal info
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Adds requirements-dev.txt
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Adds Merge Request CI
Signed-off-by: Iliyan Georgiev iliyan.georgiev@arm.com