feat(Discord Node): Overhaul (#5351)

Github issue / Community forum post (link here to close automatically):

---------

Co-authored-by: Giulio Andreini <g.andreini@gmail.com>
Co-authored-by: Marcus <marcus@n8n.io>

packages/nodes-base/nodes/Discord/v1/Interfaces.ts

@@ -0,0 +1,31 @@
+export interface DiscordWebhook {
+	content?: string;
+	username?: string;
+	avatar_url?: string;
+	tts?: boolean;
+	file?: Buffer;
+	embeds?: any[];
+	allowed_mentions?: {
+		parse: Array<'roles' | 'users' | 'everyone'>;
+		roles: string[];
+		users: string[];
+		replied_user: boolean;
+	};
+	flags?: number;
+	attachments?: DiscordAttachment[];
+	components?: any[];
+	payload_json?: any;
+}
+
+export interface DiscordAttachment {
+	id?: string;
+	filename?: string;
+	size?: number;
+	description?: string;
+	content_type?: string;
+	url?: string;
+	proxy_url?: string;
+	height?: number;
+	width?: number;
+	ephemeral?: boolean;
+}