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Add code action for hiding imports #156

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Initially taken from: haskell/haskell-ide-engine#1191

It would be nice if there was a code action for hiding imports which are unused and being shadowed by local declarations.

This is complicated because it requires some detailed information on the provenance of these names in order to hide them (for example if they are record fields).
An example:

Given the following warning:

triangle/Main.hs:83:26: warning: [-Wname-shadowing]
    This binding for ‘window’ shadows the existing bindings
      imported from ‘Graphics.Vulkan’ at triangle/Main.hs:(29,1)-(45,59)
      (and originally defined in ‘Graphics.Vulkan.Extensions.VK_NN_vi_surface’)
      imported from ‘Graphics.Vulkan’ at triangle/Main.hs:(29,1)-(45,59)
      (and originally defined in ‘Graphics.Vulkan.Extensions.VK_KHR_xlib_surface’)
      imported from ‘Graphics.Vulkan’ at triangle/Main.hs:(29,1)-(45,59)
      (and originally defined in ‘Graphics.Vulkan.Extensions.VK_KHR_xcb_surface’)
      imported from ‘Graphics.Vulkan’ at triangle/Main.hs:(29,1)-(45,59)
      (and originally defined in ‘Graphics.Vulkan.Extensions.VK_KHR_android_surface’)

As a first step, we can try to implement a mechanism to hide a symbol that is name shadowing and can improve this with some time!

There are two different implementation paths ahead:

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