Add tableTest format type for .table files

[nchaugen]

Summary

• Add a new tableTest format type for standalone .table files in both Gradle and Maven plugins
• Follows the Gherkin extension pattern: no default includes, target must be set explicitly
• Extends the existing TableTestFormatterFunc glue code to handle .table files alongside .java/.kt

Depends on #2879 (bump tabletest-formatter to 1.1.0).

Test plan

• Unit test: behaviorTableFile() in TableTestFormatterStepTest passes
• Integration test: TableTestExtensionTest.defaultFormatting() passes — verifies only targeted files are formatted
• CI build passes