Werk #13474: Monitor and inventorize Checkmk agent plugins and local checks

This werk adds the feature of inventorizing and monitoring the plugins and local checks that are deployed on the monitored host.

The check plugin checkkmk_agent_plugins displays a summary (count) of the deployed plugins. Levels can be imposed on the versions of the plugins (for details refer to the plugins man page).

Inventorized are the plugin names, their versions, and their caching interval.

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