fix(types): add hosted shell response stream events

[theamodhshetty]

Summary

• add the missing hosted shell stream event interfaces to the Responses API types
• include them in both ResponseStreamEvent and the parsed stream event union used by responses.stream()
• add a compile-time regression test covering the raw union and the typed .on(...) listener surface

Fixes #1750.

Testing

• ./node_modules/.bin/jest tests/responses.test.ts --runInBand
• ./scripts/build
• ./node_modules/.bin/eslint src/lib/responses/EventTypes.ts src/resources/responses/responses.ts tests/responses.test.ts