* ECC scalar multiplication (first draft)

* fix clippy nits

* start implementing the ro gadget: 1st design Poseidon + truncate

* truncate to 128 bits

* implement add + double in constraints

* finish implementing constraints for ecc

* cargo fmt

* input of smul should be an array of bits

* cleanup ro a bit. Make the challenge returned be a vec of allocated bits

* switch to neptune 6.0

* start implementing high level circuit

* incomplete version of the verifier circuit with many TODOS

* optimize ecc ops. add i ==0 case to the circuit

* fix 0/1 constants at the circuit

* wrap CompressedGroupElement of Pallas and Vesta

* cargo fmt

* generate poseidon constants once instead of every time we call get_challenge

* Implement RO-based poseidon to use outside of circuit. Reorganize the repo

* add inner circuit to verification circuit

* start adding folding of the io. there is an error in the first call to  mult_mod

* add test to check that bellperson-nonnative is compatible with nova

* remove swap file

* add another test that fails

* add inputs to the circuits in tests

* rename q to m in circuit.rs. add more tests in test_bellperson_non_native. change a in test_mult_mod to expose error

* push test for equal_with_carried. fix the issue is src/r1cs.rs

* cargo fmt + update the verifier circuit: add folding of X and update all hashes with X

* make limb_width and n_limbs parameters

* make params part of h1

* allocate the field order as constant. add check that z0 == zi when i == 0

* fix error in test_poseidon_ro

* remove merge error

* small fixes

* small fixes to comments

* clippy lints

* small edits; rename tests

* move inputize before from_num

* _limbs --> _bn

* _limbs --> _bn

Co-authored-by: Ioanna <iontzialla@gmail.com>