Add navigation menu dropdown component

[caendesilva]

Adds a simple component for navigation menu dropdowns. While it's not automatically generated in the code as of yet, it gives a quick way to add a dropdown to published views.

I actually can't think of a good way to implement automatic dropdowns in a way that works well without a bunch of complexity. The best I can see now is to add a Blade component that can be used in published views, and we'll take it from there. #76 (comment)

Here is an example usage:

@php
  $navigation = \Hyde\Framework\Models\NavigationMenu::create();
@endphp

<x-hyde::navigation.dropdown label="About us">
  @foreach ($navigation->items as $item)
    <li>
      @include('hyde::components.navigation.navigation-link')
    </li>
  @endforeach
</x-hyde::navigation.dropdown>

[codecov]

Codecov Report

Merging #464 (118e5c6) into master (a088804) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #464   +/-   ##
=========================================
  Coverage     99.60%   99.60%           
  Complexity      923      923           
=========================================
  Files           109      109           
  Lines          2277     2277           
=========================================
  Hits           2268     2268           
  Misses            9        9           

Impacted Files	Coverage Δ
packages/framework/src/Contracts/AbstractPage.php	100.00% <ø> (ø)

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