ble_rssi distance estimation

**Describe the problem you have/What new integration you would like**

Please consider adding distance estimation based on BLE tracking RSSI.

**Please describe your use case for this integration and alternatives you've tried:**

**Additional context**

This can be great starting point
https://github.com/ESPresense/ESPresense/blob/master/lib/BleFingerprint/FilteredDistance.cpp

maybe @chbmuc want help ?

The request names no ESPHome files or tests; start by reviewing the referenced lib/BleFingerprint/FilteredDistance.cpp implementation. First establish how BLE RSSI distance estimation should integrate with ESPHome and what distance behavior is expected; done requires an agreed feature scope and working integration.

Written by the indexing model from the issue text.