feat(perimgr): add function to retrieve detaching CB

Allows to get the CB pointer for a Peripheral Manager Bus Type. It can be used to verify if it is already set and also in case the application needs to change the CB to something else and latter restore the original CB to that Bus Type.

Author: SuGlider

cores/esp32/esp32-hal-periman.h

@@ -134,6 +134,10 @@ int8_t perimanGetPinBusChannel(uint8_t pin);
 // Sets the peripheral destructor callback. Used to destroy bus when pin is assigned another function
 bool perimanSetBusDeinit(peripheral_bus_type_t type, peripheral_bus_deinit_cb_t cb);
 
+// Get the peripheral destructor callback. It allows changing/restoring the peripheral pin function detaching, if necessary
+// retrns NULL is none is set
+peripheral_bus_deinit_cb_t perimanSetBusDeinit(peripheral_bus_type_t type);
+
 // Check if given pin is a valid GPIO number
 bool perimanPinIsValid(uint8_t pin);