Add TortoiseORM demo

[audreyfeldroy]

This PR adds examples/tortoiseorm_demo.py which adapts https://tortoise.github.io/getting_started.html to work fully with Air, displaying data on an index page.

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• New feature
  • Core Air (Air Tags, Request/Response cycle, etc)
  • Optional (Authentication, CSRF, etc)
  • Third-Party Integrated (Cookbook documentation on using Air databases or a task manager, etc)
  • Out-of-Scope (Formal integration with databases, external task managers, or commercial services etc - won't be accepted, please create a separate project)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Example Air app
• Other (please describe):

Pull request tasks

The following have been completed for this task:

• Code changes
• Documentation changes for new or changed features
• Alterations of behavior come with a working implementation in the examples folder
• Tests on new or altered behaviors

Checklist

• I have run just test and just qa, ensuring my code changes passes all existing tests
• I have performed a self-review of my own code
• I have ensured that there are tests to cover my changes

Demo or screenshot

Other information

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[audreyfeldroy]

The test failure is unrelated to the actual code in this PR