E2E demo for unbranded

[msyyc]

• typespec for unbranded demo: https://github.com/allenjzhang/typespec-e2e-demo
• current generated Python SDK with http-client-python: add python client code(todoApp) allenjzhang/typespec-e2e-demo#11

For feature gap or bugs, please see sub-issues and tasks list:

Tasks

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1. Python Emitter should auto-install or detect the missing dependencies for un-branded scenario microsoft/typespec#5169
   1_0_E2E emitter:client:python +2
   
2. Support status code range for errors #2940
   +0
   
3. paging support for unbranded #2936
   +0
   
4. Support multi namespaces #2795
   +0
   
5. ignore cookie authentication #2938
   +0
   
6. Emitter crash if no tspconfig file #2933
   bug +1
   
7. Unbranded CodeGen should generate error models instead of reusing the model from core library #2937
   +0
   

[msyyc]

We shall also track these issues: https://github.com/microsoft/typespec/issues?q=is%3Aissue%20state%3Aopen%20label%3A1_0_E2E%20label%3Aemitter%3Aclient%3Apython

[iscai-msft]

Everything linked is closed