srv_filter_available should include information about state of the filter

During a session the user may end up with several filers assigned to the same variable, applied to different modules. The list of available filters displays the filter id, i.e. dataset name and variable name, and duplicates are distinguished by adding a numeric index. This list should display filter status so that the user can have an overview of the available filters.

The suggested solution is to add help icons to the side of the filter state ids and add tooltips to those help icons.

It would be best if the contents of the tooltip can be derived from a `teal_slice` as that is what is used to build the list.