bluetooth: services: Add Channel Sounding Distance Estimation library

[olivier-le-sage]

First draft of a mini-toolkit for processing CS results.

[NordicBuilder]

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Build number: 8

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You can find the documentation preview for this PR here.

Preview links for modified nRF Connect SDK documents:

https://ncsdoc.z6.web.core.windows.net/PR-21126/nrf/libraries/bluetooth/cs_de.html