feat(#4): added pom, settings and base classes

[maxonfjvipon]

Closes: #4

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PR-Codex overview

This PR updates various GitHub actions, configurations, and code files. It also adds license headers to source code files.

Detailed summary

• Updates the runs-on field in GitHub actions to use Ubuntu 22.04.
• Updates the versions of actions/checkout and g4s8/xcop-action in GitHub actions.
• Adds branch filters for push and pull_request events in the pdd.yaml GitHub workflow.
• Adds a .gitattributes file to handle line endings.
• Updates the os and java matrix in the mvn.yaml GitHub workflow.
• Updates the versions of actions/checkout and actions/setup-java in the mvn.yaml GitHub workflow.
• Updates the runs-on field in the codecov.yaml GitHub workflow.
• Adds license headers to package-info.java and InlineMojoTest.java files.
• Updates the README.md file with new badges and removes outdated tool references.
• Adds a test case for InlineMojo in InlineMojoTest.java.
• Adds license headers to InlineMojo.java file.

The following files were skipped due to too many changes: src/main/java/org/eolang/ineo/InlineMojo.java, pom.xml

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[maxonfjvipon]

@rultor merge

[rultor]

@rultor merge

@maxonfjvipon OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@maxonfjvipon Done! FYI, the full log is here (took me 1min)