* [nRF Connect] Port shell example

* Add streamer implementation for zephyr
* Create nrfconnect project for the shell example
* Fix some compilation issues

* [shell] Replace ARRAY_SIZE with ArraySize macro

ArraySize was already defined in CodeUtils.h and ARRAY_SIZE
was interfering with Zephyr-provided macros. By the way,
initialize streamer earlier to avoid uninitialized memory
access.

* [shell] Fix base64 decode

* [nRF Connect] Build shell example in CI, add README

* [nRF Connect] Enable CHIP shell lib via Kconfig

Make build of the CHIP shell library optional by introducing
a Kconfig setting.

* [nrF Connect] Add streamer backend compatible with Zephyr shell

* Restyled by prettier-markdown

* Change examples workflow

* [shell] Fix assert usage

* [shell] Fix otcli commands for embedded and adjust nRF Connect port

Co-authored-by: Restyled.io <commits@restyled.io>