Add missing packages + updates

[espenhgn]

Fixes #310

Changes proposed in this pull request:

• adds several R and Python packages
• pull some R builds from https://mrcieu.r-universe.dev/packages
• update PLINK2 binaries

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  section of the CONTRIBUTING docs.
• I've updated or added any relevant documentation and docstrings where appropriate in the codebase.
• If this PR fixes a bug, I've added a test that will fail without my fix.
• If this PR adds a new feature, I've added tests that sufficiently cover my new functionality.