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merkle: Make MerkleNode.collect return a set of nodes instead of a dict

Antoine Lambert requested to merge generated-differential-D8686-source into generated-differential-D8686-target

Previously the MerkleNode.collect method was returning a dict whose keys are node types and values dict of {<node_hash>: <node_data>}.

In order to give more flexibility to client code for the processing of collected nodes, prefer to simply return a set of MerkleNode.

As a consequence, MerkleNode objects need to be hashable by Python so add a new abstract method hash_to_int for converting hash value to integer that derived classes must implement.

Closes #4633 (closed)

Migrated from D8686 (view on Phabricator)

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