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This is an alternative implementation to #15848. ## Summary This PR adds support for re-export conventions for imports for stub files. **How does this work?** * Add a new flag on the `Import` and `ImportFrom` definitions to indicate whether they're being exported or not * Add a new enum to indicate whether the symbol lookup is happening within the same file or is being queried from another file (e.g., an import statement) * When a `Symbol` is being queried, we'll skip the definitions that are (a) coming from a stub file (b) external lookup and (c) check the re-export flag on the definition This implementation does not yet support `__all__` and `*` imports as both are features that needs to be implemented independently. closes: #14099 closes: #15476 ## Test Plan Add test cases, update existing ones if required.