[RTL_433][BREAKING] Beta support for FSK modulation, webUI frequency and active receiver change (#1812)

* [FSK] Add Lilygo Heltec environment with FSK modulation

Enable RTL_433 frequency and active receiver change with WebUI
Add FSK environment for Heltec and Lilygo

.github/workflows/build.yml

@@ -39,8 +39,10 @@ jobs:
           - "esp32dev-rtl_433"
           - "esp32doitv1-aithinker-r01-sx1278"
           - "heltec-rtl_433"
+          - "heltec-rtl_433-fsk"
           - "heltec-ble"
           - "lilygo-rtl_433"
+          - "lilygo-rtl_433-fsk"
           - "lilygo-ble"
           - "esp32dev-multi_receiver"
           - "esp32dev-multi_receiver-pilight"