Common Server Options: create shared type #25570

Add ServerRequestOptions. Make each runtime options type extend it, with Omit for gaps. Add the BUGBOT rule. Type-only, no runtime behavior change.

For Node and Bun: ignoreRequestBody request type (Node, Bun node:http). Narrow the parameter to RequestOptions & HttpIncomingMessage. This is not a break: a tsc check showed that callbacks typed with RequestOptions, and untyped callbacks that read req.path, both still compile. Users get the real IncomingMessage fields. A comment marks the RequestOptions half as deprecated, for removal in v12. The as cast in packages/node/src/integrations/http/httpServerIntegration.ts:91 goes away.