Initial support for Wi-Fi services

This brings support for Wi-Fi services in OH. Enable and package them. Runs them as systemd service.

recipes-openharmony/openharmony/files/wifi_hal.service

+[Unit]
+Description=OpenHarmony Wi-Fi HAL service
+
+[Service]
+Type=exec
+User=root
+Group=root
+SupplementaryGroups=shell
+ExecStart=/usr/bin/wifi_hal_service
+Restart=on-failure
+StartLimitInterval=300
+StartLimitBurst=5
+
+[Install]
+WantedBy=multi-user.target