add nugget and nibble boards for 38c3 (#5609)

* add nugget and nibble boards for 38c3

* mark those boards extra for now

variants/nugget_s2_lora/platformio.ini

@@ -0,0 +1,6 @@
+[env:nugget-s2-lora]
+extends = esp32s2_base
+board = lolin_s2_mini
+board_level = extra
+build_flags = 
+  ${esp32s2_base.build_flags} -D PRIVATE_HW -I variants/nugget_s2_lora

variants/nugget_s2_lora/variant.h

@@ -0,0 +1,23 @@
+#define I2C_SDA 34 // I2C pins for this board
+#define I2C_SCL 36
+
+#define LED_PIN 15 // If defined we will blink this LED
+
+#define HAS_NEOPIXEL                         // Enable the use of neopixels
+#define NEOPIXEL_COUNT 3                     // How many neopixels are connected
+#define NEOPIXEL_DATA 12                     // gpio pin used to send data to the neopixels
+#define NEOPIXEL_TYPE (NEO_GRB + NEO_KHZ800) // type of neopixels in use
+
+#define BUTTON_PIN 0 // If defined, this will be used for user button presses
+#define BUTTON_NEED_PULLUP
+
+#define USE_RF95
+#define LORA_SCK 6
+#define LORA_MISO 8
+#define LORA_MOSI 10
+#define LORA_CS 13
+#define LORA_DIO0 16
+#define LORA_RESET 5
+
+#define LORA_DIO1 RADIOLIB_NC
+#define LORA_DIO2 RADIOLIB_NC