Add cardiac-geometries-core

[finsberg]

Checklist

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[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/cardiac-geometries-core/meta.yaml) and found it was in an excellent condition.

[finsberg]

@conda-forge/python, ready for review!