fix: [http] Consume unread body and trailers before reading next request (#3990)

- Added `ServerRequest.finalize()`:  consuming all unread body stream and trailers.
  - This is cleanup method for reading next request from same keep-alive connection.
  - Needed when handler didn't consume all body and trailers even after responding.
- refactor: `ServerRequest._bodyStream()`, `ServerRequestBody` are removed.
  - Now using `bodyReader()` and `chunkedBodyReader()` instead.
- fix: Trailers should only be read `transfer-encoding` is `chunked` and `trailer` header is set and its value is valid.
- fix: use `Headers.append()` on reading trailers.
- fix: delete `trailer` field from headers after reading trailers.
- reorg: Several functions related to IO are moved into `http/io.ts`

0 files changed, 0 insertions, 0 deletions