targets: add WaveShare ESP-C3-32S-Kit

I've had this board for a while now, but never added proper TinyGo
support. So here is a PR to do just that.

GNUmakefile

@@ -835,6 +835,8 @@ ifneq ($(XTENSA), 0)
 	$(TINYGO) build -size short -o test.bin -target mch2022             examples/machinetest
 	@$(MD5SUM) test.bin
 endif
+	$(TINYGO) build -size short -o test.bin -target=esp-c3-32s-kit      examples/blinky1
+	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=qtpy-esp32c3        examples/machinetest
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=m5stamp-c3          examples/machinetest

src/machine/board_esp-c3-32s-kit.go

@@ -0,0 +1,40 @@
+//go:build esp_c3_32s_kit
+
+package machine
+
+// See:
+//  * https://www.waveshare.com/w/upload/8/8f/Esp32-c3s_specification.pdf
+//  * https://www.waveshare.com/w/upload/4/46/Nodemcu-esp-c3-32s-kit-schematics.pdf
+
+// Digital Pins
+const (
+	IO0  = GPIO0
+	IO1  = GPIO1
+	IO2  = GPIO2
+	IO3  = GPIO3
+	IO4  = GPIO4
+	IO5  = GPIO5
+	IO6  = GPIO6
+	IO7  = GPIO7
+	IO8  = GPIO8
+	IO9  = GPIO9
+	IO18 = GPIO18
+	IO19 = GPIO19
+)
+
+const (
+	LED_RED   = IO3
+	LED_GREEN = IO4
+	LED_BLUE  = IO5
+
+	LED = LED_RED
+
+	LED1 = LED_RED
+	LED2 = LED_GREEN
+)
+
+// I2C pins
+const (
+	SDA_PIN = NoPin
+	SCL_PIN = NoPin
+)

targets/esp-c3-32s-kit.json

@@ -0,0 +1,5 @@
+{
+	"inherits": ["esp32c3"],
+	"build-tags": ["esp_c3_32s_kit"],
+	"serial-port": ["1a86:7523"]
+}