Add JGAurora A5S and A1 (STM32F103ZET6) (#14291)

- Now compiles and works correctly with changes to HAL timers and watchdog.
- Does NOT include awesome work on touch screen function.
- Does have working LCD and SD-based EEPROM.

Marlin/src/pins/pins.h

@@ -428,6 +428,8 @@
   #include "pins_MORPHEUS.h"          // STM32F1                                    env:STM32F1
 #elif MB(MKS_ROBIN)
   #include "pins_MKS_ROBIN.h"         // STM32F1                                    env:mks_robin
+#elif MB(JGAURORA_A5S_A1)
+  #include "pins_JGAURORA_A5S_A1.h"   // STM32F1                                    env:JGAURORA_A5S_A1
 
 //
 // STM32 ARM Cortex-M4F