Stark continuous read-only memory example (#940)

* create file

* continuity and single value constraint

* imp air

* permutation constraint

* evaluate function for SingleValueConstraint

* add last element constraint

* add public inputs

* add sort function for the trace

* add integration test

* fix clippy

* fix constraints

* add documentation

* handle possible panic

* rename variables

* fix doc

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Co-authored-by: Nicole <nicole@Nicoles-MacBook-Air.local>
Co-authored-by: jotabulacios <jbulacios@fi.uba.ar>
Co-authored-by: Nicole Graus <nicole.graus@lambdaclass.com>

provers/stark/src/examples/mod.rs

@@ -4,5 +4,6 @@ pub mod fibonacci_2_cols_shifted;
 pub mod fibonacci_2_columns;
 pub mod fibonacci_rap;
 pub mod quadratic_air;
+pub mod read_only_memory;
 pub mod simple_fibonacci;
 pub mod simple_periodic_cols;