fix(typespec): Misc fixes in typespec definitions

[creatorrr]

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Signed-off-by: Diwank Singh Tomer [email protected]

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[!IMPORTANT] Redefines ChildStreamEndpoint, updates dependencies, and removes YieldStep from task definitions in typespec files.

• Behavior:
  • Redefines ChildStreamEndpoint in interfaces.tsp to use SSEStream<StreamEvent<T>>.
  • Removes YieldStep from task definitions in endpoints.tsp and openapi-0.4.0.yaml.
• Models:
  • Adds StreamEvent<T> union in types.tsp.
• Dependencies:
  • Updates package.json dependencies to @typespec/[email protected], @typespec/[email protected], @typespec/[email protected], and others.
• Misc:
  • Adds TasksGetRoute interface in endpoints.tsp.
  • Enables omit-unreachable-types in tspconfig.yaml.

^{This description was created by for 2f2eafe947d32195d3b9653132daf7547cf5c626. It will automatically update as commits are pushed.}