Add TSL2591 sensor support (#4014)

src/modules/Telemetry/Sensor/TSL2591Sensor.h

@@ -0,0 +1,17 @@
+#include "../mesh/generated/meshtastic/telemetry.pb.h"
+#include "TelemetrySensor.h"
+#include <Adafruit_TSL2591.h>
+
+class TSL2591Sensor : public TelemetrySensor
+{
+  private:
+    Adafruit_TSL2591 tsl;
+
+  protected:
+    virtual void setup() override;
+
+  public:
+    TSL2591Sensor();
+    virtual int32_t runOnce() override;
+    virtual bool getMetrics(meshtastic_Telemetry *measurement) override;
+};