public static int getVectorSize(final Bytes code, final int offsetCountByteIndex) {
    return (code.toArrayUnsafe()[offsetCountByteIndex] & 0xff) + 1;
  }
Gets vector size. Vector size is one greater than length immediate, because (a) zero length
tables are useless and (b) it allows for 256 byte tables

@param code the code
@param offsetCountByteIndex the offset count byte index
@return the vector size
evm/src/main/java/org/hyperledger/besu/evm/operation/RelativeJumpVectorOperation.java