Add BLE tracker and Bluetooth proxy configuration

Add missing section, This was copied from the x2 config. It seems to have been missed here.

athom-energy-monitor-x6.yaml

@@ -149,6 +149,19 @@ improv_serial:
 esp32_improv:
   authorizer: none
 
+esp32_ble_tracker:
+  scan_parameters:
+    # Don't auto start BLE scanning, we control it in the `api` block's automation.
+    continuous: false
+    active: true  # send scan-request packets to gather more info, like device name for some devices.
+    interval: 320ms  # default 320ms - how long to spend on each advert channel
+    window:   300ms  # default 30ms - how long to actually "listen" in each interval. Reduce this if device is unstable.
+    # If the device cannot keep up or becomes unstable, reduce the "window" setting. This may be
+    # required if your device is controlling other sensors or doing PWM for lights etc.
+
+bluetooth_proxy:
+  active: true
+
 dashboard_import:
   package_import_url: github://athom-tech/esp32-configs/athom-energy-monitor-x6.yaml