Variation of `run_binary` to capture `stdout` and/or `stderr`

The `run_binary` rule assumes that the output to be captured is written to file(s) by the binary either in implied or through `args` location(s). This does not completely replace the usage of [`genrule`](https://bazel.build/reference/be/general#genrule) because the use case of capturing output from a `stdout`-only binary is not supported. Is it possible to capture output in Bazel, or does this use case still have to be done through `genrule`?

Start by reading the existing run_binary rule and comparing its output-file handling with Bazel's genrule behavior. Determine the expected semantics for capturing stdout and/or stderr, then document and verify a supported approach that covers the stdout-only use case without relying on genrule.

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