Vivarium-public-health

- Fix bug in timing of disease transition observations
- Add logging when adding risks with a relative risk less than 1 from artifact

- Update Vivarium pin

- Create new LBWSG components
- Fix a bug when stratifying newly born simulants
- Fix pandas deprecation warnings
- Fix a bug when stratifying an empty population
- Allow configuration of sex subsetting of the population
- Add support for empty populations
- Fix a bug in counting deaths and ylls
- Refactor DiseaseState to be compatible with latest release of vivarium
- Add CODEOWNERS

- Improve ScaleUp component configuration
- Enable Mortality component to handle affected unmodeled causes
- Refactor RiskEffect calculation for clarity and extensibility
- Implement ResultsStratifier to stratify outputs
- Refactor all observers to be compatible with the ResultsStratifier component

- Autoformat code with black and isort.
- Add black and isort checks to CI.

- Update CI