## Description:
Generate requirements_* from manifests (if present). If not, fallback to the current approach of reading `REQUIREMENTS` from the module attribute. I disabled exploring the children of the `homeassistant.components.*` packages since that will just add a dependency (from the manifest) due to each of the python files in the package. Just having one for the top level package should be sufficient.
**Related issue (if applicable):** relates to #22700
## Checklist:
- [x] The code change is tested and works locally.
- [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**
- [x] There is no commented out code in this PR.
[ex-requir]: https://github.com/home-assistant/home-assistant/blob/dev/homeassistant/components/keyboard/__init__.py#L14
[ex-import]: https://github.com/home-assistant/home-assistant/blob/dev/homeassistant/components/keyboard/__init__.py#L23
Co-authored-by: Jason Hu <awaregit@gmail.com>
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