Feature show log files in UI plugins

[ck-c8y]

Add a UI for viewing the logs of tedge components:

• mosquitto: { type = "mosquitto", path = "/var/log/mosquitto/mosquitto.log" }
• software-management { type = "software-management", path = "/var/log/tedge/agent/software-*" }
• c8y-log-plugin { type = "c8y-log-plugin", path = "/var/log/c8y-log-plugin/c8y-log-plugin.log" }
• c8y-configuration-plugin: { type = "c8y-configuration-plugin", path = "/var/log/c8y-configuration-plugin/c8y-configuration-plugin.log" }
• c8y-mapper-collectd: { type = "c8y-mapper-collectd", path = "/var/log/tedge-mapper-collectd/tedge-mapper-collectd.log" }
• c8y-mapper-c8y: { type = "c8y-mapper-c8y", path = "/var/log/tedge-mapper-c8y/tedge-mapper-c8y.log" }
• management-ui: { type = "management-ui", path = "/var/log/tedge-ui/tedge-ui.log" }