Reference implementation for the gadget that builds a merkle opening proof
| PoseidonBranch | The Poseidon structure will accept a number of inputs equal to the arity.
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| PoseidonLevel | Represents a Merkle-Tree Level inside of a PoseidonBranch.
It stores the leaves as BlsScalar and the offset which represents
the position on the level where the hash of the previous PoseidonLevel
is stored in.
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| merkle_opening_gadget | Provided a kelvin::Branch, a &mut StandardComposer, a leaf value and a root, print inside of the
constraint system a Merkle Tree Proof that hashes up from the searched leaf in kelvin until
the root of the tree constraining each level hashed on the process.
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| merkle_opening_scalar_verification | Provided a PoseidonBranch and a Merkle Tree root, verify that
the path to the root is correct.
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