[Automated][tcgc] Document versionsEnum and SSE metadata in emitter guideline

[tadelesh]

Resolve: #5060
Resolve: #613

[tadelesh]

@copilot We also need an authoring doc under client part of websites to resolve: #613

[github-actions]

No changes needing a change description found.

[Copilot]

@copilot We also need an authoring doc under client part of websites to resolve: #613

Added website/src/content/docs/docs/howtos/Generate client libraries/13streaming.mdx covering:

• JSONL streaming response (JsonlStream<T>)
• SSE streaming response (SSEStream<TEvents>) with per-language generated code examples
• Terminal events (@terminalEvent)
• Event envelopes (@Events.data)
• Unnamed (message) events
• SSE streaming request
• Custom streaming body (@streamOf)

Also updated 04method.mdx to cross-reference the new page. Commit: docs(tcgc): add streaming/SSE authoring doc under howtos/Generate client libraries.

[tadelesh]

@copilot Since language does not support them now, all language part leave // unsupported.

[Copilot]

@copilot Since language does not support them now, all language part leave // unsupported.

Done. All language tabs in both ClientTabs blocks now show // unsupported (or # unsupported for Python). Commit: docs(tcgc): replace language code snippets with // unsupported in streaming doc.

[azure-sdk-automation]

You can try these changes here

🛝 Playground	🌐 Website

[tadelesh]

@copilot SSE examples all need language section

[Copilot]

@copilot SSE examples all need language section

Done. All SSE sub-sections (Terminal events, Event envelopes, Unnamed events, SSE streaming request) now have <ClientTabs> with // unsupported for each language. Commit: docs(tcgc): add ClientTabs with language sections to all SSE examples.

[tadelesh]

@copilot Custom streaming body lack of language part.

[Copilot]

@copilot Custom streaming body lack of language part.

Done. The Custom streaming body section now has <ClientTabs> with // unsupported for each language. Commit: docs(tcgc): add ClientTabs with language sections to custom streaming body example.