[Java] StructVector throws with ExtensionType

[FiV0]

Describe the bug, including details regarding any error messages, version, and platform.

Currently when creating a struct vector with a child being an extension type things throw:

 @Test
 public void testStructVectorWithExtensionTypes() {
 TestExtensionType.UuidType uuidType = new TestExtensionType.UuidType();
 Field uuidField = new Field("struct_child", FieldType.nullable(uuidType), null);
 Field structField = new Field("struct", FieldType.nullable(new ArrowType.Struct()), List.of(uuidField));
 // throws
 StructVector s1 = new StructVector(structField, allocator, null);
 // doesn't throw
 StructVector s2 = (StructVector) structField.createVector(allocator);
 s1.close();
 s2.close();
 }

I am mainly running into this while trying to create a TransferPair.

 @Test
 public void testStructVectorTransferPairWithExtensionType() {
 TestExtensionType.UuidType uuidType = new TestExtensionType.UuidType();
 Field uuidField = new Field("uuid_child", FieldType.nullable(uuidType), null);
 Field structField = new Field("struct", FieldType.nullable(new ArrowType.Struct()), List.of(uuidField));

 StructVector s1 = (StructVector) structField.createVector(allocator);
 TestExtensionType.UuidVector uuidVector = s1.addOrGet("uuid_child", FieldType.nullable(uuidType), TestExtensionType.UuidVector.class);
 s1.setValueCount(1);
 uuidVector.set(0, new UUID(1, 2));
 s1.setIndexDefined(0);

 TransferPair tp = s1.getTransferPair(structField, allocator);
 final StructVector toVector = (StructVector) tp.getTo();
 assertEquals(s1.getField(), toVector.getField());
 assertEquals(s1.getField().getChildren().get(0), toVector.getField().getChildren().get(0));
 // also fails but probably another issue
// assertEquals(s1.getValueCount(), toVector.getValueCount());
// assertEquals(s1, toVector);

 s1.close();
 toVector.close();
 }

Component(s)

Java