This large refactor allows future re-use of the existing tests for `FrozenGraph`, which does not implement `GraphTopologyAddition`, but instead has to convert from a different graph which does.
- Fix tests for `GraphTopologyDeletion` hard-coding Graph instead of using the trait.
- Fix some tests silently depending on macro call site uses.
- Change `GraphTopologyAddition` tests to use `Default::default` instead of `new`.
- Add new tests for `GraphTopology::vertex_map` and `edge_map` that also depend on `GraphTopologyAddition`, removing these dependencies from the existing tests.
- Add new test macro `graph_topology_addition_deletion_tests` for tests that need deletion and addition.
warrence