* Add a MerkleProof.processProof utility function

* Add changelog entry

* fix lint

* return index when processingProof

* fix lint

* fix test

* Apply suggestions from code review

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* improve documentation

* Apply suggestions from code review

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* remove index - see discussion in the PR

* update changelog

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>