Add new sample for ca recovery

[danewalton]

• Creates a new sample at the high level for CA recovery. It is a direct copy of sample_azure_iot except for the name.
• Creates a separate sample in the ESP build tree which pulls in and builds the above sample instead of sample_azure_iot.

[danewalton]

closing to make it based on ADU

[danewalton]

Reopening to keep it simple

[ericwolz]

our ESPRESSIF folder is a mess. it should be

iot-middleware-freertos-samples/demos/projects/ESPRESSIF
                                                  |
                                                  + ESP32
                                                      |
                                                      + adu
                                                      |
                                                      + aziotkit
                                                      |
                                                      + generic
                                                      |
                                                      + ca-recovery

[danewalton]

our ESPRESSIF folder is a mess. it should be

iot-middleware-freertos-samples/demos/projects/ESPRESSIF
                                                  |
                                                  + ESP32
                                                      |
                                                      + adu
                                                      |
                                                      + aziotkit
                                                      |
                                                      + generic
                                                      |
                                                      + ca-recovery

Noted. We'll try and patch that up in another PR.