Racetrack-job-runner

Added
- This package is published to PyPI and can be installed with `pip install racetrack_job_runner`.

Added
- Added Recordkeeper utilities functions to keep track of Recordkeeper's predecessor ID.

Fixed
- Fixed escaping newline characters in JOB_MANIFEST_YAML env variable.

Changed
- Job's metadata like name, version and manifest YAML are passed as environment variables: `JOB_NAME`, `JOB_VERSION` and `JOB_MANIFEST_YAML`.
They should be either provided by infrastructure target or set manually.
That means you no longer need to put
dockerfile
COPY ./job.yaml /project/job.yaml
ENV JOB_NAME="{{ manifest.name }}"
ENV JOB_VERSION="{{ manifest.version }}"

in your Dockerfile.

Changed
- `racetrack_client` and `racetrack_commons` modules has been moved under `racetrack_job_wrapper` package
to prevent conflicts with original `racetrack_client` package.

Changed
- `pydantic` package is no longer a direct dependency of this library.