Initial commit with basic project structure and Firebeetle 2 board definition

boards/espressif/esp32s2_saola/esp32s2_saola.yaml

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+identifier: esp32s2_saola
+name: ESP32-S2 Saola
+type: mcu
+arch: xtensa
+toolchain:
+  - zephyr
+supported:
+  - adc
+  - dac
+  - gpio
+  - i2c
+  - i2s
+  - watchdog
+  - uart
+  - nvs
+  - pwm
+  - spi
+  - counter
+  - entropy
+  - input
+testing:
+  ignore_tags:
+    - bluetooth
+vendor: espressif