debounce buttons with a non-memorizing startup delay based on FreeRTOS tasks

[dhebbeker]

This uses FreeRTOS task notification features to implement a non-memorizing startup debouncer.

See

• 📄 differentiation of different debouncing approaches
• https://github.com/Task-Tracker-Systems/Task-Tracker-Device/discussions/118

Inspired by https://github.com/Task-Tracker-Systems/ESP32-Playground/commit/df3d00246c2374b2f9a2bd579b88879711a34c4b

Resolves #113.

[dhebbeker]

There are two problems:

• the required stack size per task is quite high (>1000 words) and I have a task per pin
• I have a dependency to FreeRTOS which must be stubbed for unit tests; or I do not test the board adapter package resolved ✅