feat: add tabletest-formatter for Java and Kotlin

[nchaugen]

Adds native support for tabletest-formatter, which formats @TableTest tables in Java and Kotlin source files.

All configuration is read from .editorconfig files — only version is exposed in the Spotless DSL.

Follows the glue class pattern (like CleanthatJava, PalantirJavaFormat). Single Maven coordinate: org.tabletest:tabletest-formatter-core:1.0.1.

Verified: testlib:test (271 pass), spotbugsMain, plugin compilation, spotlessApply.

[nedtwigg]

Great PR for a neat formatter!

• Add annotations to disable your tests on Java 17
• Add yourself into the root README and then run spotlessApply so that the inline js renders

  • spotless/README.md

    Lines 90 to 94 in bb7e7be

    	lib('java.ForbidModuleImportsStep') +'{{yes}} | {{yes}} | {{no}} | {{no}} |',
    	extra('java.EclipseJdtFormatterStep') +'{{yes}} | {{yes}} | {{yes}} | {{no}} |',
    	lib('java.FormatAnnotationsStep') +'{{yes}} | {{yes}} | {{no}} | {{no}} |',
    	lib('java.CleanthatJavaStep') +'{{yes}} | {{yes}} | {{no}} | {{no}} |',
    	lib('json.gson.GsonStep') +'{{yes}} | {{yes}} | {{no}} | {{no}} |',

[nchaugen]

Thanks for the nice feedback! I've added test annotations, removed the unused field that I think upset SpotBugs, and added java.TableTestFormatterStep to the README.

[nedtwigg]

Ah, it's a little harder than I realized. In lib/build.gradle, you'll need to exclude your tableTestFormatter from NEEDS_GLUE unless building on Java 21+. We run our deployment on Java 21+, so it will be in the deployed binaries.

[nchaugen]

I see. I made inclusion of tableTestFormatter conditional based on Java version. Would that work?

[nedtwigg]

Yup :)

[nchaugen]

Awesome! Thank you so much!