Add sensor services and events to Flet

[FeodorFitsner]

Introduced support for device sensors including accelerometer, user accelerometer, gyroscope, magnetometer, and barometer. Added corresponding Dart services, Python control classes, event types, and documentation. Updated mkdocs navigation and provided example usage for each sensor.

Summary by Sourcery

Add cross-platform sensor streaming support and corresponding Python APIs for accessing device motion and environmental data from Flet apps.

New Features:

• Introduce Flutter sensor services for accelerometer, user accelerometer, gyroscope, magnetometer, and barometer controls with configurable sampling intervals and error handling.
• Expose new Python service controls and strongly typed events for reading sensor data and reporting sensor errors in Flet applications.
• Provide example applications demonstrating basic usage of each sensor service in Python.

Enhancements:

• Wire new sensor service controls into the Flet core extension so they can be instantiated from control definitions.
• Expand the Python package exports to include new sensor controls and their event types.

Documentation:

• Add user-facing documentation pages for new sensor controls and their event types, and integrate them into the mkdocs navigation.

[cloudflare-workers-and-pages]

Deploying flet-docs with    Cloudflare Pages

Latest commit:	d393a6d
Status:	✅  Deploy successful!
Preview URL:	https://37730cad.flet-docs.pages.dev
Branch Preview URL:	https://sensors.flet-docs.pages.dev

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