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/databases/entities/WebhookEntity.ts

@@ -1,3 +1,4 @@
+import { IHttpRequestMethods } from 'n8n-workflow';
 import { Column, Entity, Index, PrimaryColumn } from 'typeorm';
 
 @Entity()
@@ -9,8 +10,8 @@ export class WebhookEntity {
 	@PrimaryColumn()
 	webhookPath: string;
 
-	@PrimaryColumn()
-	method: string;
+	@PrimaryColumn({ type: 'text' })
+	method: IHttpRequestMethods;
 
 	@Column()
 	node: string;