test: guard eth alias against submodule shadowing

[BobTheBuidler]

Summary

Add a regression test that keeps dank_mids.eth resolving to the dank_eth alias after submodule imports.

Rationale

Lazy import aliasing can be shadowed when dank_mids.eth is imported as a submodule, breaking access to get_code. This test locks in the correct alias behavior.

Details

• Add a subprocess-based unit test in tests/unit/test_lazy_imports.py that stubs dank_mids.brownie_patch.dank_eth and forces a dank_mids.eth submodule import.
• Assert dank_mids.eth still resolves to the stub (or at least that get_code remains bound).

Testing

• Not run (test is expected to fail on current master).

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Pair failing regression test with implementation fix

This commit adds a strict regression assertion for dank_mids.eth alias behavior but does not include the corresponding production change, so the suite goes red when this commit is applied on its own (e.g., PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 pytest tests/unit/test_lazy_imports.py fails in this test). That makes the change non-mergeable in isolation; either include the fix in the same change set or mark this test as expected-failing until the implementation lands.

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