[FIX] web: reimplement `group_by_tooltip` option in kanban

This option hadn't been implemented in the new views.
It allows to display informative explanations as tooltips on column over.

It can be set on a many2one field in the kanban view, e.g.:

```<field name="stage_id" options='{"group_by_tooltip":
    {"<tooltipFieldOnStageModel>": "<ABeautifulTitle>"}
}'/>
```

An extra RPC needs to be done on the many2one relation to fetch these additional
fields and the data are stored in the datapoint under the key `tooltipData`.

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