Report Response, Request, NodeHTTPResponse memory cost more accurately

[Jarred-Sumner]

What does this PR do?

Report Response, Request, NodeHTTPResponse memory cost more accurately so it includes backpressure. This is not perfect.

How did you verify your code works?

There is one test but it's not very good

[robobun]

^{Updated 11:44 PM PT - Aug 3rd, 2025}

❌ @Jarred-Sumner, your commit 8045d03 has 5 failures in Build #22131:

• test/integration/mysql2/mysql2.test.ts - timeout on 🍎 13 aarch64
• test/js/third_party/body-parser/express-memory-leak.test.ts - timeout on 🐧 12 x64-asan
• test/js/third_party/next-auth/next-auth.test.ts - 1 failing on 🪟 2019 x64
[webpack.cache.PackFileCacheStrategy] Caching failed for pack: RangeError: Out of memory
• test/js/third_party/next-auth/next-auth.test.ts - 1 failing on 🪟 2019 x64-baseline
while serializing webpack/lib/util/registerExternalSerializer.webpack-sources/ReplaceSource -> String "))"
• test/js/node/test/parallel/test-child-process-spawnsync-shell.js - timeout on 🪟 2019 x64
• test/js/node/test/parallel/test-child-process-spawnsync-shell.js - timeout on 🪟 2019 x64-baseline
• test/integration/next-pages/test/dev-server-ssr-100.test.ts - 1 failing on 🪟 2019 x64-baseline
• test/integration/next-pages/test/dev-server-ssr-100.test.ts - 1 failing on 🪟 2019 x64

---

🧪   To try this PR locally:

bunx bun-pr 21595

That installs a local version of the PR into your bun-21595 executable, so you can run:

bun-21595 --bun