Generated Java files are generated on Windows with LF, showing up in IDEs as modified

### Describe the feature

When developing on Windows with its CRLF line endings, I noticed the following:

* Git checks out the previously generated files with CRLF
* The next generator run re-creates them with LF
* Now the IDE shows a lot of changes

I'm suggesting to add a `.gitattributes` file to ensure that Git checks out the files with LF on Windows, and I will provide a PR

### Contribution

@ahus1