Interface to retrigger the tedge-agent log-plugins list commands

[reubenmiller]

Is your feature improvement request related to a problem? Please describe.

When the output of a log plugin has a new log entry, there isn't any easy mechanism to communicate to the tedge-agent that it should re-execute the log plugin list commands.

For instance below shows the problematic workflow:

1. Install tedge-container-plugin which will include a "container" log plugin which reports the list of container on the device.
2. Install a new container called "app1" (via the container software management plugin)
3. The user wishes to get the logs from the command, however the "app1::container" log type isn't included in the log type list, so it is not selectable in the Cumulocity Device Management UI

Describe the solution you'd like

Add support for a mechanism that a component can get the tedge-agent to re-evaluate the log types list without having to restart the tedge-agent service.

Describe alternatives you've considered

Additional context