Create dimensions provider

To measure the available space of an element when it
should take up the "rest" of the page. This matches
what `ListCollection` is doing internally but makes
the mechanism available in a composable component.

ui/packages/consul-ui/app/components/providers/dimension/index.hbs

@@ -0,0 +1,4 @@
+<div {{create-ref 'element'}} {{did-insert this.measureDimensions}}>
+  {{on-window 'resize' this.handleWindowResize}}
+  {{yield (hash data=this.data)}}
+</div>

ui/packages/consul-ui/app/components/providers/dimension/index.js

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+import Component from '@glimmer/component';
+import { tracked } from '@glimmer/tracking';
+import { action } from '@ember/object';
+import { inject as service } from '@ember/service';
+import { ref } from 'ember-ref-bucket';
+import { htmlSafe } from '@ember/template';
+
+export default class DimensionsProvider extends Component {
+  @service dom;
+  @ref('element') element;
+
+  @tracked height;
+
+  get data() {
+    const { height, fillRemainingHeightStyle } = this;
+
+    return {
+      height,
+      fillRemainingHeightStyle,
+    };
+  }
+
+  get fillRemainingHeightStyle() {
+    return htmlSafe(`height: ${this.height}px;`);
+  }
+
+  get bottomBoundary() {
+    return this.args.bottomBoundary || this.footer;
+  }
+
+  get footer() {
+    return document.querySelector('footer[role="contentinfo"]');
+  }
+
+  get viewport() {
+    return this.dom.viewport();
+  }
+
+  @action measureDimensions(element) {
+    const { viewport, bottomBoundary } = this;
+
+    const height =
+      viewport.innerHeight - (element.getBoundingClientRect().top + bottomBoundary.clientHeight);
+
+    this.height = height;
+  }
+
+  @action handleWindowResize() {
+    const { element } = this;
+
+    this.measureDimensions(element);
+  }
+}