Add DiffAllPathsQuery benchmark

[LucasG0]

This PR adds a benchmark for DiffAllPathsQuery, based on a dedicated data generator CarWithDiffInSecondBranchGenerator mainly responsible for:

• Loading cars in main branch
• Rebasing diff branch on main branch
• Loading changes (attributes/relationships updates, adding new cars) in diff branch

Note that schema/DataGenerator are still not part of BenchmarkConfig. I think DataGenerator used for benchmarking might be too close to logic of the test (mainly, the query used) to be defined within BenchmarkConfig. We could discuss that at some point @dgarros and I might submit another PR for this.