Add first test for dynamic slots

test/runtime/samples/dynamic-slots-dev/Nested.svelte

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+<script>
+  let slot = 'dynamic-slot';
+
+	const f = () => {
+		slot = 'thing';
+	}
+</script>
+
+<div>
+  <slot name={slot} />
+  <slot />
+  <slot name='static' />
+</div>

test/runtime/samples/dynamic-slots-dev/_config.js

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+export default {
+  compileOptions: {
+    dev: true
+  },
+
+	html: '<div><p slot="dynamic-slot">Hello</p><p slot="default">Hello</p><p slot="static">Hello</p></div>',
+
+  warnings: ['<Nested> received an unexpected slot "dynamic-slot-again".']
+};

test/runtime/samples/dynamic-slots-dev/main.svelte

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+<script>
+	import Nested from './Nested.svelte';
+
+  let slot = 'dynamic-slot';
+
+  function y() {
+    slot = 'another-slot';
+  }
+</script>
+
+<Nested>
+	<p slot={slot}>Hello</p>
+	<p slot='default'>Hello</p>
+	<p slot='static'>Hello</p>
+  <p slot={`${slot}-again`}>Hello</p>
+</Nested>