refactor(core): Parse Webhook request bodies on-demand (#6394)

Also,
1. Consistent CORS support ~on all three webhook types~ waiting webhooks never supported CORS. I'll fix that in another PR
2. [Fixes binary-data handling when request body is text, json, or xml](https://linear.app/n8n/issue/NODE-505/webhook-binary-data-handling-fails-for-textplain-files).
3. Reduced number of middleware that each request has to go through.
4. Removed the need to maintain webhook endpoints in the auth-exception list.
5. Skip all middlewares (apart from `compression`) on Webhook routes. 
6. move `multipart/form-data` support out of individual nodes
7. upgrade `formidable`
8. fix the filenames on binary-data in webhooks nodes
9. add unit tests and integration tests for webhook request handling, and increase test coverage

packages/workflow/src/Interfaces.ts

@@ -1235,6 +1235,24 @@ export interface ITriggerResponse {
 
 export type WebhookSetupMethodNames = 'checkExists' | 'create' | 'delete';
 
+export namespace MultiPartFormData {
+	export interface File {
+		filepath: string;
+		mimetype?: string;
+		originalFilename?: string;
+		newFilename: string;
+	}
+
+	export type Request = express.Request<
+		{},
+		{},
+		{
+			data: Record<string, string | string[]>;
+			files: Record<string, File | File[]>;
+		}
+	>;
+}
+
 export interface INodeType {
 	description: INodeTypeDescription;
 	execute?(
@@ -1492,7 +1510,7 @@ export interface INodeHookDescription {
 }
 
 export interface IWebhookData {
-	httpMethod: WebhookHttpMethod;
+	httpMethod: IHttpRequestMethods;
 	node: string;
 	path: string;
 	webhookDescription: IWebhookDescription;
@@ -1502,8 +1520,8 @@ export interface IWebhookData {
 }
 
 export interface IWebhookDescription {
-	[key: string]: WebhookHttpMethod | WebhookResponseMode | boolean | string | undefined;
-	httpMethod: WebhookHttpMethod | string;
+	[key: string]: IHttpRequestMethods | WebhookResponseMode | boolean | string | undefined;
+	httpMethod: IHttpRequestMethods | string;
 	isFullPath?: boolean;
 	name: 'default' | 'setup';
 	path: string;
@@ -1555,8 +1573,6 @@ export interface IWorkflowMetadata {
 	active: boolean;
 }
 
-export type WebhookHttpMethod = 'DELETE' | 'GET' | 'HEAD' | 'PATCH' | 'POST' | 'PUT' | 'OPTIONS';
-
 export interface IWebhookResponseData {
 	workflowData?: INodeExecutionData[][];
 	webhookResponse?: any;
@@ -1811,6 +1827,10 @@ export interface WorkflowTestData {
 			[key: string]: any[][];
 		};
 	};
+	trigger?: {
+		mode: WorkflowExecuteMode;
+		input: INodeExecutionData;
+	};
 }
 
 export type LogTypes = 'debug' | 'verbose' | 'info' | 'warn' | 'error';