Add generate random data example

[Sumeet213]

Adds example for generating random test data in Notion databases.

Python version of the JS SDK's generate-random-data example. Creates fake data using Faker library and demonstrates basic database operations.

Related to #278

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.50%. Comparing base (7b467fe) to head (7940ace).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #292   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files           7        7           
  Lines         401      401           
=======================================
  Hits          399      399           
  Misses          2        2           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[ramnes]

Great, thanks! There's some little things that are not exactly the same as in the JS SDK and I'd prefer that we stay as close as possible to the JS SDK. I'll merge as is but feel free to open another PR if you're interested in bringing this closer to the original implementation. :)