[Component]: A split-view component

[Matsuuu]

A split view component, that allows for a slider-powered splitting of views

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The splitter should be draggable, resizing the views.

API mockup:

<simplr-split-view>
  <my-view></my-view>
  <simplr-splitter></simplr-splitter>
  <my-other-view></my-other-view>
</simplr-split-view>