Preventative healthcare maintenance example to python/samples/healthcare_preventative

[bconsolvo]

…healthcare_maintenance

Why are these changes needed?

New preventative healthcare maintenance example for Autogen users.

Related issue number

N/A

Checks

• [x] I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• [x] I've added tests (if relevant) corresponding to the changes introduced in this PR.
• [x] I've made sure all auto checks have passed.

[bconsolvo]

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[bconsolvo]

Wondering if you can add this PR example?

[ekzhu]

Feels like it is more suitable for an independent repo and sharing on social media?