public ModifyableTableDescriptor setValue(byte[] key, byte[] value) {
      return setValue(toBytesOrNull(key, v -> v), toBytesOrNull(value, v -> v));
    }
Setter for storing metadata as a (key, value) pair in {@link #values} map
@param key   The key.
@param value The value. If null, removes the setting.
@return the modifyable TD
@see #values
hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java