[linux] Add native menu bar support about flutter-desktop-embedding HOT 5 CLOSED

The most Flutter-like way to do this is probably to have a MenuBuilder widget (name subject to bikeshedding) that controls an underlying MenuManager class that does the channel communication. Then the menu configuration is set up in the build pipeline the same way as other UI elements.

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Also, just to capture something we discussed out of band: menus get more complex when keyboard shortcuts enter the picture, because keyboard shortcut handling requires coordination with other kinds of input (e.g. IME). So I think this issue is meant to capture menus without shortcuts, and we'll file another issue to track keyboard shortcuts.

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GtkUIManager was deprecated in gtk3 and will be removed in 4. AMTK might prove useful to you, it's recently moved to be part of the tepl project.
https://developer.gnome.org/amtk/unstable/amtk-intro.html
https://developer.gnome.org/tepl/stable/amtk.html

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Retitling to reflect the remaining scope.

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PR #130 fixed this (in the limited way we can using GLFW); just forgot to close this.

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