🔨 Creality v4 with STM32 HAL (#21999)

- New STM32 env for Creality V4 boards.
- Separate Libmaple targets into their own `ini` file.
- Temporarily remove unusable targets from `pins.h`.

Co-authored-by: ellensp <ellensp@hotmsil.com>
Co-authored-by: Scott Lahteine <github@thinkyhead.com>

platformio.ini

@@ -24,6 +24,7 @@ extra_configs =
     ini/native.ini
     ini/samd51.ini
     ini/stm32f0.ini
+    ini/stm32f1-maple.ini
     ini/stm32f1.ini
     ini/stm32f4.ini
     ini/stm32f7.ini