fix: http_server_native to close ReadableStream on abort signal

[Thesephi]

See PR towards the upstream repo: oakserver#685

How to test

Step 1

clone this branch, check that all tests pass

deno test -A

Step 2

comment out this line:

oak/http_server_native.ts

Line 105 in 19f37f7

signal?.addEventListener("abort", () => controller.close(), { once: true });

then rerun the test, 1 should fail:

Application.listen() - no options - aborted after onListen ...
ok | 0 passed | 0 failed (2s)

error: Promise resolution is still pending but the event loop has already resolved.