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Move SWHID<->node ID conversion in the Java backend

Antoine Pietri requested to merge generated-differential-D6676-source into generated-differential-D6676-target

Doing the SWHID <-> node ID conversion in the Python side prevents using the minimal perfect hash function for SWHID -> node ID. This design is inherited from when we thought we could have a really thin Java layer and write all the code in Python, but this turned out to be infeasible in practice.

Instead, we are instead moving more and more things in the Java layer, until ultimately the entire Python RPC API might be replaced by a pure Java implementation.

This commit drops the swh/graph/graph.py file for the same reasons outlined above (it's infeasible to write graph traversal algorithms in pure Python), along with its associated tests.

Migrated from D6676 (view on Phabricator)

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