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/cli/src/Interfaces.ts

@@ -1,4 +1,4 @@
-import type { Application } from 'express';
+import type { Application, Request, Response } from 'express';
 import type {
 	ExecutionError,
 	ICredentialDataDecryptedObject,
@@ -22,6 +22,7 @@ import type {
 	IExecutionsSummary,
 	FeatureFlags,
 	IUserSettings,
+	IHttpRequestMethods,
 } from 'n8n-workflow';
 
 import type { ActiveWorkflowRunner } from '@/ActiveWorkflowRunner';
@@ -300,6 +301,19 @@ export interface IExternalHooksClass {
 	run(hookName: string, hookParameters?: any[]): Promise<void>;
 }
 
+export type WebhookCORSRequest = Request & { method: 'OPTIONS' };
+
+export type WebhookRequest = Request<{ path: string }> & { method: IHttpRequestMethods };
+
+export type WaitingWebhookRequest = WebhookRequest & {
+	params: WebhookRequest['path'] & { suffix?: string };
+};
+
+export interface IWebhookManager {
+	getWebhookMethods?: (path: string) => Promise<IHttpRequestMethods[]>;
+	executeWebhook(req: WebhookRequest, res: Response): Promise<IResponseCallbackData>;
+}
+
 export interface IDiagnosticInfo {
 	versionCli: string;
 	databaseType: DatabaseType;