Remove Memoized for byte arrays. Byte-arrays are not immutable (#2712)

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

api/all/src/main/java/io/opentelemetry/api/trace/ImmutableSpanContext.java

@@ -31,18 +31,6 @@ abstract class ImmutableSpanContext implements SpanContext {
         traceIdHex, spanIdHex, traceFlags, traceState, remote);
   }
 
-  @Override
-  @Memoized
-  public byte[] getTraceIdBytes() {
-    return SpanContext.super.getTraceIdBytes();
-  }
-
-  @Override
-  @Memoized
-  public byte[] getSpanIdBytes() {
-    return SpanContext.super.getSpanIdBytes();
-  }
-
   @Override
   @Memoized
   public boolean isValid() {