Logs Panel: Support to customize line formats in Dashboards

> it would be great to have an option of the log panel to set the display line using a template in order to have kind of complex syntax: `pod {{ pod }} in {{ datacenter }} [{{ filepath }}#L{{ lineno }}]: [{{ pid }}] {{ message }}` > > alternatively it would be great to have an option to display key=value for each `displayedFields` _Originally posted by @fatpat in [#95553](https://github.com/grafana/grafana/issues/95553#issuecomment-3805874667)_