Remove FixedSizeExtensionType

Author: jhrotko

vector/src/main/java/org/apache/arrow/vector/BaseFixedWidthVector.java

@@ -70,6 +70,7 @@ public BaseFixedWidthVector(Field field, final BufferAllocator allocator, final
     refreshValueCapacity();
   }
 
+  @Override
   public int getTypeWidth() {
     return typeWidth;
   }

vector/src/main/java/org/apache/arrow/vector/FixedSizeExtensionType.java

@@ -31,4 +31,7 @@ public interface FixedWidthVector extends ElementAddressableVector {
 
   /** Zero out the underlying buffer backing this vector. */
   void zeroVector();
+
+  /** Get the width of the type in bytes. */
+  int getTypeWidth();
 }

vector/src/main/java/org/apache/arrow/vector/FixedWidthVector.java

@@ -53,7 +53,7 @@
  * @see NullableUuidHolder
  */
 public class UuidVector extends ExtensionTypeVector<FixedSizeBinaryVector>
-    implements ValueIterableVector<UUID>, FixedWidthVector, FixedSizeExtensionType {
+    implements ValueIterableVector<UUID>, FixedWidthVector {
   private final Field field;
 
   /** The fixed byte width of UUID values (16 bytes). */