Enable custom Serial Version UID

[yuri1969]

What's changed?

To be able to choose from 1, 1L, or any other value.

What's your motivation?

Codebases often go for the 1L value, so having an option to use that value is cool.

Anything in particular you'd like reviewers to focus on?

Unit test coverage, maybe?

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[github-actions]

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[timtebeek]

Thanks for the addition here! Should help folks standardize if they had a certain preference.