When parsing SMS, it can happen that we receive CRLF in the SMS payload (happened to me when receiving provider texts).
As an example, we can receive:
"""
Hello <CR><LF>
World!
"""
With previous implementation, second consume_to_stop_tag was stopping in <CR><LF> and rest of the code was failing for obvious reasons.
With this commit we consume the full payload as bytes.
Move the connectivity cellular into the connectivity/cellular component
directory. So we can avoid duplicating the mbed-os source tree in a
central UNITTESTS folder.