Create guide and evals for the out-of-order-html-streaming use case

[chrome-devrel-infra]

Declaratively update a page with content streamed later into the same HTML document or via imperative JavaScript APIs.

Affected web-feature IDs: template-for, html-setters, html-streaming-setters

Use case subdir: guides/performance/out-of-order-html-streaming

Required files:

• Use case metadata (guide.md frontmatter)
• demo.html
• Use case guidance (guide.md)
• expectations.md
• tasks/task.md
• negative-demo.html
• grader.ts