feat(language): implement clone

Author: ObserverOfTime

src/main/java/io/github/treesitter/jtreesitter/Language.java

@@ -8,7 +8,7 @@
 
 /** A class that defines how to parse a particular language. */
 @NullMarked
-public final class Language {
+public final class Language implements Cloneable {
     /**
      * The latest ABI version that is supported by the current version of the library.
      *
@@ -192,6 +192,17 @@ public Query query(String source) throws QueryError {
         return new Query(this, source);
     }
 
+    /**
+     * Get another reference to the language.
+     *
+     * @since 0.24.0
+     */
+    @Override
+    @SuppressWarnings("MethodDoesntCallSuperMethod")
+    public Language clone() {
+        return new Language(ts_language_copy(self));
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;

src/test/java/io/github/treesitter/jtreesitter/LanguageTest.java

@@ -92,6 +92,6 @@ void query() {
     @Test
     void testEquals() {
         var other = new Language(TreeSitterJava.language());
-        assertEquals(language, other);
+        assertEquals(other, language.clone());
     }
 }