Use indentation settings in dx fmt and vscode extension

Adds the ability to specify an indent string to public autofmt methods - either
a sequence of spaces or a tab character.

Get the indentation style and size from rustfmt for dx fmt, or from the editor
settings for the vscode extension.

Closes #1595

packages/autofmt/tests/wrong/comments-tab.rsx

@@ -0,0 +1,7 @@
+rsx! {
+	div {
+		// Comments
+		class: "asdasd",
+		"hello world"
+	}
+}

packages/autofmt/tests/wrong/comments-tab.wrong.rsx

@@ -0,0 +1,5 @@
+rsx! {
+	div {
+		// Comments
+		class: "asdasd", "hello world" }
+}

packages/autofmt/tests/wrong/multi-tab.rsx

@@ -0,0 +1,3 @@
+fn app(cx: Scope) -> Element {
+	cx.render(rsx! { div { "hello world" } })
+}

packages/autofmt/tests/wrong/multi-tab.wrong.rsx

@@ -0,0 +1,5 @@
+fn app(cx: Scope) -> Element {
+	cx.render(rsx! {
+		div {"hello world" }
+	})
+}

packages/autofmt/tests/wrong/multiexpr-tab.rsx

@@ -0,0 +1,8 @@
+fn ItWroks() {
+	cx.render(rsx! {
+		div { class: "flex flex-wrap items-center dark:text-white py-16 border-t font-light",
+			left,
+			right
+		}
+	})
+}

packages/autofmt/tests/wrong/multiexpr-tab.wrong.rsx

@@ -0,0 +1,5 @@
+fn ItWroks() {
+	cx.render(rsx! {
+		div { class: "flex flex-wrap items-center dark:text-white py-16 border-t font-light", left, right }
+	})
+}