Closes #63 add onco table and plot examples

[jeffreyad]

Pull Request

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[bms63]

I'm not very savvy with oncology stuff - but looks really nice from a quick glance.

maybe some folks from admiral onco team would be able to help with review - @bundfussr @pharmaverse/admiralonco any interest?

[github-actions]

The website is available at https://pharmaverse.github.io/examples/63-add-onco-table-and-plot-examples.