chore: add tests for slot binding

Author: baseballyama

tests/fixtures/parser/ast/ts-slot-binding01-config.json

@@ -0,0 +1,3 @@
+{
+    "parser": "typescript-eslint-parser-for-extra-files"
+}

tests/fixtures/parser/ast/ts-slot-binding01-input-child.svelte

@@ -0,0 +1,5 @@
+<script lang="ts">
+  let foo = { prop: true };
+</script>
+
+<slot {foo}></slot>

tests/fixtures/parser/ast/ts-slot-binding01-input.svelte

@@ -0,0 +1,7 @@
+<script lang="ts">
+  import Component from "./ts-slot-binding01-input-child.svelte";
+</script>
+
+<Component>
+  <div let:foo={bar}>{bar.prop}</div>
+</Component>