[doc] Add shape about new manage visibility menu

[AxelRICHARD]

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[sbegaudeau]

We will not decide in any way where to put these menus. The specifier will tell us. One could want the hide menu to be on a node containing other nodes for example. The shape should just be, we will add two menus, the specifier will tell us where. The first one will ask for an icon and trigger a piece of code on the backend. It should be hide the element as a default example. The second one will have a specific behavior hardcoded in the frontend which should open the manage visibility dialog.

It will thus require two ADRs with the hide element as the first one which should let specifier add an icon to execute something on a node. We could provide an example to hide nodes in the palette of newly created nodes in the view DSL for example.

In Papaya, we could try to use another icon to trigger another piece of behavior.

The second ADR will be about this specific menu (which we will identify with a specific id just like the search command in the command palette for example) and then this manage visibility menu will be hardcoded in term of behavior. It will not let specifiers define any custom behavior, it just show/hides child nodes.