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f20a9ffe34
`os.walk` is a generator that can iteratively navigate from the specified path, top-bottom. However, most of the calls to `os.walk` in the project cast the call to `list()`, which makes it traverse the path and recursively find all nested directories. This is commonly not needed, as we end up just using a `[0]` index to only access the root path. This change adds a few utils that simplifies listing files/directories, and by default does it non-recursively. Performance gains shouldn't be noticeable in systems with high-speed storage, but we can avoid the edge cases of users having too many nested directories, by avoiding unneeded I/O.