private void encodeAddress(GrowableByteBuffer buffer, TensorAddress address) {
        for (int i = 0; i < address.size(); i++)
            buffer.putUtf8String(address.label(i));
    }
Implementation of a sparse binary format for a tensor on the form:

Sorted dimensions = num_dimensions [dimension_str_len dimension_str_bytes]*
Cells = num_cells [label_1_str_len label_1_str_bytes ... label_N_str_len label_N_str_bytes cell_value]*

Note that the dimensions are sorted and the tensor address labels are given in the same sorted order.
Unspecified labels are encoded as the empty string "".

@author geirst
vespajlib/src/main/java/com/yahoo/tensor/serialization/SparseBinaryFormat.java