[Gtk] Implement ListView

[lytico]

https://learn.microsoft.com/de-de/dotnet/maui/user-interface/controls/listview?view=net-maui-8.0

issue

ListView implementation is completely missing

Controls

ListView

Cell

SwitchCell
TextCell

ImageCell

ViewCell

EntryCell

Handlers

ListViewHandler.Gtk

MauiListView

CellHandlers ... missing

hints for implementation

Gtk.Tree

... but maybe Gtk.TreeView is the complete wrong way.

if CollectionView is working properly, it could be the better choice

https://github.com/GtkSharp/GtkSharp/blob/develop/Source/Samples/Sections/Widgets/ListStoreSection.cs

https://docs.gtk.org/gtk3/class.CellRenderer.html

https://docs.gtk.org/gtk3/class.CellRendererToggle.html
for SwitchCell

https://docs.gtk.org/gtk3/class.CellRendererText.html
for TextCell

https://docs.gtk.org/gtk3/class.CellRendererPixbuf.html
for ImageCell

Problems are:
EntryCell

ViewCell

https://github.com/mono/xwt/tree/main/Xwt.Gtk/Xwt.GtkBackend.CellViews

https://stackoverflow.com/questions/62258691/gtk3-custom-cell-renderer-that-outputs-widgets