core: extend PinMode enum with INPUT_FLOATING and INPUT_ANALOG

- Add INPUT_FLOATING as an alias for INPUT to improve readability of pin configuration.
- Introduce INPUT_ANALOG and OUTPUT_OPEN_DRAIN to match ArduinoCore-API semantics.
- Keep OUTPUT_OPENDRAIN as an alias for OUTPUT_OPEN_DRAIN for backward compatibility with existing STM32duino code.

Signed-off-by: Aymane Bahssain <[email protected]>

Author: Aymane-ST

Common.h

@@ -36,11 +36,14 @@ typedef enum {
 } PinStatus;
 
 typedef enum {
-  INPUT            = 0x0,
-  OUTPUT           = 0x1,
-  INPUT_PULLUP     = 0x2,
-  INPUT_PULLDOWN   = 0x3,
-  OUTPUT_OPENDRAIN = 0x4,
+  INPUT             = 0x0,
+  OUTPUT            = 0x1,
+  INPUT_PULLUP      = 0x2,
+  INPUT_FLOATING    = INPUT,
+  INPUT_PULLDOWN    = 0x3,
+  INPUT_ANALOG      = 0x4,
+  OUTPUT_OPEN_DRAIN = 0x5,
+  OUTPUT_OPENDRAIN  = OUTPUT_OPEN_DRAIN,
 } PinMode;
 
 typedef enum {