Fix and reorganize node:http

[heimskr]

What does this PR do?

Fixes some bugs in node:http and splits it up into multiple modules (_http_agent, _http_client, _http_incoming, _http_outgoing and _http_server) to match Node.js's organization.

• Documentation or TypeScript types
• Code changes

How did you verify your code works?

Ran existing node:http tests. None appear to have regressed.

[robobun]

^{Updated 6:07 PM PT - Apr 14th, 2025}

❌ @heimskr, your commit 1de23d1 has 2 failures in Build #14940:

• test/js/node/test/parallel/test-http-client-response-timeout.js - timeout on 🪟 2019 x64
• test/js/node/test/parallel/test-http-client-response-timeout.js - timeout on 🪟 2019 x64-baseline
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🪟 2019 x64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🪟 2019 x64-baseline
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 3.21 aarch64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 3.21 x64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🍎 13 aarch64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 3.21 x64-baseline
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🍎 14 aarch64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 12 aarch64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 20.04 aarch64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 24.04 aarch64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 22.04 aarch64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🍎 14 x64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🍎 13 x64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 12 x64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 22.04 x64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 24.04 x64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 12 x64-baseline
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 20.04 x64
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 22.04 x64-baseline
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 20.04 x64-baseline
• test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🐧 24.04 x64-baseline

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🧪   try this PR locally:

bunx bun-pr 19021