[flake8-builtins] Implement import, lambda, and module shadowing (#12546)

## Summary

<!-- What's the purpose of the change? What does it do, and why? -->
Extend `flake8-builtins` to imports, lambda-arguments, and modules to be
consistent with original checker
[flake8_builtins](https://github.com/gforcada/flake8-builtins/blob/main/flake8_builtins.py).

closes #12540 

## Details

- Implement builtin-import-shadowing (A004)
- Stop tracking imports shadowing in builtin-variable-shadowing (A001)
in preview mode.
- Implement builtin-lambda-argument-shadowing (A005)
- Implement builtin-module-shadowing (A006)
  - Add new option `linter.flake8_builtins.builtins_allowed_modules`

## Test Plan

cargo test

crates/ruff_python_stdlib/src/path.rs

@@ -16,6 +16,16 @@ pub fn is_jupyter_notebook(path: &Path) -> bool {
     path.extension().is_some_and(|ext| ext == "ipynb")
 }
 
+/// Return `true` if a [`Path`] should use the name of its parent directory as its module name.
+pub fn is_module_file(path: &Path) -> bool {
+    path.file_name().is_some_and(|file_name| {
+        file_name == "__init__.py"
+            || file_name == "__init__.pyi"
+            || file_name == "__main__.py"
+            || file_name == "__main__.pyi"
+    })
+}
+
 #[cfg(test)]
 mod tests {
     use std::path::Path;