Add examples to Python SDK docs

[jesshitchcock]

Noted during support week of 27 October 2025 that our Python SDK has no working examples, we need to add some.

Link to Python SDK docs here

[linear]

PROD-397

[12ian34]

there are some examples in the repo which could be adapted from the jupyter notebook and added to the docs
https://github.com/lightdash/python-sdk/tree/main/examples