feat(#69): factorialize

[maxonfjvipon]

Ref: #69

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PR-Codex overview

This PR updates licenses and adds Spring Boot annotations.

Detailed summary

• Added MIT License to Java files
• Added Spring annotations to FactorialApplication and Main
• Introduced Factorial class for factorial calculation

The following files were skipped due to too many changes: src/main/java/org/eolang/ineo/FactorializeMojo.java, src/it/factorial/pom.xml, src/main/resources/org/eolang/ineo/factorialize/Factorialized.xmir, src/main/resources/org/eolang/ineo/factorialize/Main.xmir

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[maxonfjvipon]

@rultor release, tag is 0.3.0

[rultor]

@rultor release, tag is 0.3.0

@maxonfjvipon OK, I will release it now. Please check the progress here

[rultor]

@rultor release, tag is 0.3.0

@maxonfjvipon Done! FYI, the full log is here (took me 28min)