[http-client-csharp] Add support for Streaming/JSONL scenarios

[JonathanCrd]

Based on https://typespec.io/can-i-use/http/, there are two streaming scenarios not covered yet by the code generator:

• Receive
• Send

[github-actions]

🎯 Issue Triage

This is a feature request to add support for Streaming/JSONL scenarios (both Send and Receive) in the C# HTTP client code generator, as identified from the @typespec/http-specs spec coverage page.

Category: Feature Request
Area: emitter:client:csharp

🔍 Analysis

• The issue references two unimplemented JSONL streaming scenarios in the C# code generator:
  • Receive: packages/http-specs/specs/streaming/jsonl/main.tsp lines 23–28
  • Send: packages/http-specs/specs/streaming/jsonl/main.tsp lines 15–21
• These are tracked against the `(typespec.io/redacted) compatibility page, indicating they are known gaps in the emitter's coverage.
• No duplicate issues were found.

📝 Suggested next steps

• Implement code generation for the JSONL streaming Receive scenario in http-client-csharp
• Implement code generation for the JSONL streaming Send scenario in http-client-csharp
• Add/update Spector tests to cover both scenarios
• Update the can-i-use compatibility status once implemented

Generated by Agentic Triage