The new CyclicImports.qll is a fairly straight port of Cyclic.qll, with
the main changes being:
- We now use Module instead of ModuleValue everywhere
- We use getModuleReference instead of pointsTo
- is_import_time was replaced with a use of `ImportTimeScope`
The predicate that changed the most is `stmt_imports`, which in the
original just did `s.getASubExpression().pointsTo(result)`. The new
version has three branches, one for each kind of import, and with
special handling of imports from within a submodule (which is not
something that should be flagged).
No test changes.
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