[pyproject] Use hatch and versioningit for modern project management

MANIFEST.in

conda/meta.yaml

pyproject.toml

setup.py

src/idiap_devtools/click.py

src/idiap_devtools/conda.py

src/idiap_devtools/gitlab/__init__.py

src/idiap_devtools/gitlab/changelog.py

src/idiap_devtools/gitlab/release.py

src/idiap_devtools/gitlab/runners.py

src/idiap_devtools/profile.py

src/idiap_devtools/python.py

src/idiap_devtools/scripts/cli.py

src/idiap_devtools/scripts/env.py

src/idiap_devtools/scripts/fullenv.py

src/idiap_devtools/scripts/gitlab/__init__.py

src/idiap_devtools/scripts/gitlab/badges.py

src/idiap_devtools/scripts/gitlab/changelog.py

src/idiap_devtools/scripts/gitlab/getpath.py

src/idiap_devtools/scripts/gitlab/jobs.py