Sound Pressure API

[SheepSeb]

Pull Request Overview

This pull request adds:

• a sound pressure API , similar to the libtock-c version. The API provides a function that simulates a synchronous sound pressusre reading and also functions to initiate a reading, register/unregister a listener, check for driver existence, enable/disable the sound pressure measurement
• an example app which samples the sound pressure sensor every 1 second and prints the measured sound pressure
• a fake sound pressure driver, for testing
• unit tests for the fake driver and for the user space library

Testing Strategy

This PR was tested with the unit tests and by running the example app on a microbit v2 board

Documentation Updated

no updates are required

[jrvanwhy]

bors r+

[bors]

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