Log start of i2c setup (#5049)

esphome/components/i2c/i2c_bus_esp_idf.cpp

@@ -14,6 +14,7 @@ namespace i2c {
 static const char *const TAG = "i2c.idf";
 
 void IDFI2CBus::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up I2C bus...");
   static i2c_port_t next_port = 0;
   port_ = next_port++;