Add integration for Grundfos (BLE)

Feature Requests
11

To find Mac address:
Enable device tracker in HA

device_tracker:
  - platform: bluetooth_le_tracker

ESPHome

esphome:
  name: esp32-grundfos
  friendly_name:  ESP Grundfos
esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "--secret---"

ota:
  password: "--secret--"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Esp32-Grundfos Fallback Hotspot"
    password: "--secret--"

captive_portal:

esp32_ble_tracker:

ble_client:
  - mac_address: 80:6F:xx:xx:xx
    id: radiator_pump

sensor:
  - platform: alpha3
    ble_client_id: radiator_pump
    flow:
      name: "Radiator Pump Flow"
    head:
      name: "Radiator Pump Head"
    speed:
      name: "Radiator Pump Speed"
    power:
      name: "Radiator Pump Power"
    voltage:
      name: "Radiator Pump Voltage"
    current:
      name: "Radiator Pump Current"