serialzied claim.

[ilyalesokhin-starkware]

This change is 

[ilyalesokhin-starkware]

stwo_cairo_prover/crates/cairo-air/src/air.rs line 76 at r1 (raw file):

            }
          }
        output[0] = (output.len() -1).into();

I need to add the claim len before the claim to deserialize it as Span.

Code quote:

  output[0] = (output.len() -1).into();