[SYS][BREAKING] Add gateway states, Offline mode and refactor sleep (#2020)

Gaterway states to improve LED management
Make the sleep function accessible outside BT
BREAKING remove sleep for ESP8266
BREAKING lowpowermode API changed to powermode and new mode definition

Co-authored-by: Florian <1technophile@users.noreply.github.com>

.gitignore

@@ -12,4 +12,5 @@ CMakeLists.txt
 dependencies.lock
 sdkconfig.*
 !sdkconfig.defaults
-__pycache__
+__pycache__
+*.pem