openharmony-standard: Component packaging and systemd integration

Related to eclipse/oniro-core/meta-openharmony#4

recipes-openharmony/openharmony/files/accesstoken.service

+[Unit]
+Description=OpenHarmony AccessTokenManager
+Requires=samgr.service
+
+[Service]
+Type=exec
+# should be 750 root:system
+ExecStartPre=install -m 755 -d /data/service/e10/access_token
+# should run as system:system
+ExecStart=/usr/bin/sa_main /system/profile/accesstoken_service.xml
+
+[Install]
+WantedBy=multi-user.target