Fix C-METADATA violations

[SergioGasquez]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo xtask fmt-packages command to ensure that all changed code is formatted correctly.
• My changes were added to the CHANGELOG.md in the proper section.
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Pull Request Details 📖

Description

• Fix C-METADATA violations
• Normalized most of the packages keywords and categories
• Removed authors key from some packages

Testing

NA

[bjoernQ]

Thanks! Good choice of keywords / categories IMHO

[jessebraham]

Thanks!