Appender: support primitive lists (1.4)

This is a backport of the PR #398 to `v1.4-andium` stable branch.

This change allows to append to primitive `LIST` columns using the same
methods that were used to append to primitive `ARRAY` columns.

Appending to nested lists or lists of arrays is not yet supported.

Testing: existing tests restructured and extended to cover primitive
`LIST`s.

Author: staticlibs

src/jni/bindings_vector.cpp

@@ -80,21 +80,20 @@ JNIEXPORT jobject JNICALL Java_org_duckdb_DuckDBBindings_duckdb_1vector_1get_1co
  * Signature: (Ljava/nio/ByteBuffer;)Ljava/nio/ByteBuffer;
  */
 JNIEXPORT jobject JNICALL Java_org_duckdb_DuckDBBindings_duckdb_1vector_1get_1data(JNIEnv *env, jclass, jobject vector,
-                                                                                   jlong col_width_bytes) {
+                                                                                   jlong size_bytes) {
 
 	duckdb_vector vec = vector_buf_to_vector(env, vector);
 	if (env->ExceptionCheck()) {
 		return nullptr;
 	}
-	idx_t width = jlong_to_idx(env, col_width_bytes);
+	idx_t vector_size = jlong_to_idx(env, size_bytes);
 	if (env->ExceptionCheck()) {
 		return nullptr;
 	}
 
 	void *data = duckdb_vector_get_data(vec);
 
 	if (data != nullptr) {
-		idx_t vector_size = duckdb_vector_size() * width;
 		return make_data_buf(env, data, vector_size);
 	}