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/extension/src/main.ts

@@ -90,7 +90,7 @@ function fmtDocument(document: vscode.TextDocument) {
 		if (!editor) return; // Need an editor to apply text edits.
 
 		const contents = editor.document.getText();
-		const formatted = dioxus.format_file(contents);
+		const formatted = dioxus.format_file(contents, !editor.options.insertSpaces, editor.options.tabSize);
 
 		// Replace the entire text document
 		// Yes, this is a bit heavy handed, but the dioxus side doesn't know the line/col scheme that vscode is using