Add the SheerID student verification module (#36704)

GitOrigin-RevId: a3673c09e185c8f857d5da3e706fa9a310fba6d4

services/web/types/backend/express/request.d.ts

@@ -20,6 +20,9 @@ declare module 'express' {
     userRestrictions?: Set
     oauth_user?: OAuth2Server.User
     logger: RequestLogger
+    // Set by a body-parser `verify` callback on routes that check a webhook
+    // signature, which needs the bytes exactly as received.
+    rawBody?: Buffer | string
     i18n: {
       language: string
       translate(