Add support for Sensirion SHT3X #355

Job	Run time
build (Heltec_v3_repeater)	2m 51s
build (RAK_4631_repeater)	2m 29s
build (RAK_4631_room_server)	2m 17s
build (Heltec_v3_companion_radio_ble)	2m 50s
build (LilyGo_Tlora_C6_repeater_)	2m 6s
build (PicoW_repeater)	2m 32s
build (wio-e5-mini_repeater)	1m 32s
build (RAK_4631_companion_radio_ble)	2m 31s
build (Heltec_v3_room_server)	2m 52s
	22m 0s

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