Implement specific *all functions

Specific `_*all` and `_*all_with` functions were implemented to make
the API more concise and clean, and to replace the use of
`RELAY_CHN_ID_ALL`, which caused confusion within the API.

Refs #1085

private_include/relay_chn_core.h

@@ -9,7 +9,6 @@
 #include "esp_err.h"
 #include "esp_log.h"
 #include "esp_timer.h"
-#include "relay_chn_defs.h"
 #include "relay_chn_types.h"
 #include "relay_chn_priv_types.h"