Fix cascading sub menus bug in embedded components in v2.14.0 #4544
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The embedded-core ViewMenu (e.g. where there are view level options like Export SVG) ended up diverging slightly from the app-core ViewMenu, where it did not use CascadingMenu, and then a bug introduced during refactoring (removal of Grow component from the @jbrowse/core/ui/Menu) resulted in the cascading effect not working, instead putting all cascading menus on the screen at once
screenshot
![image](https://private-user-images.githubusercontent.com/6511937/364101057-50147fe6-8364-4394-838b-7c950b51697d.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.4QjA3GyqbwaO-wTzkG8eDvOwA65X8kZKNxoPlA8yDAA)
This fixes it by both
a) Adding the Grow back to @jbrowse/core/ui/Menu
b) Converting the embedded-core ViewMenu to use CascadingMenu, just because there are benefits to the CascadingMenu (it avoids offscreen behavior)