feat: add merkle path wrapper

[vlopes11]

A Merkle path is a vector of nodes, regardless of the Merkle tree implementation.

This commit introduces an encapsulation for such vector, also to provide functionality that is common between different algorithms such as opening verification.

related issue: #36

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1. add `MerklePath` to merkle module
2. update existing trees to return `MerklePath` instead of `Vec<Word>`

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1. move `MerklePathSet` to new `path` module

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1. MerklePathSet is using irregular path #57
   good first issue +1

[bobbinth]

Looks great! Thank you! I left a couple of small comments inline.

[bobbinth]

All looks good! Thank you!

[vlopes11]

Updating my GPG key that was out of sync (commit is the same as the approved)