package: restructure package for conda and submodule usage - #58

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-python@v5, codecov/codecov-action@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

File "/home/runner/work/dram-rules/dram-rules/./coverage.xml" doesn't exist