Mark Java/Kotlin generated bindings as linguist-generated

Hides the ~23k-line Scip.java and the Kotlin DSL files from default
GitHub diffs and excludes them from the repository's language
statistics, matching how the Go, Rust, Haskell, and TypeScript
generated bindings are handled.

Author: jupblb

.gitattributes

@@ -2,5 +2,8 @@ bindings/typescript/scip.ts linguist-generated=true
 bindings/go/scip/scip.pb.go linguist-generated=true
 bindings/rust/src/generated/scip.rs linguist-generated=true
 bindings/haskell/src/Proto/**.hs linguist-generated=true
+bindings/java/src/main/java/scip/Scip.java linguist-generated=true
+bindings/kotlin/src/main/java/scip/Scip.java linguist-generated=true
+bindings/kotlin/src/main/kotlin/scip/**.kt linguist-generated=true
 docs/scip.md linguist-generated=true
 yarn.lock linguist-generated=true