test: add tests for object destructuring with default values in "each" blocks

Author: caiquetorres

packages/svelte/tests/parser-modern/samples/each-block-object-pattern-special-characters/input.svelte

@@ -0,0 +1,9 @@
+{#each x as { y = 'z' }}{/each}
+
+{#each x as { y = '{' }}{/each}
+
+{#each x as { y = ']' }}{/each}
+
+{#each x as { y = `${`"`}` }}{/each}
+
+{#each x as { y = `${`John`}` }}{/each}