fix: return `this` from `destroy` and `end`

[danielroe]

What is the purpose of this pull request? (put an "X" next to item)

[ ] Documentation update [x] Bug fix [ ] New feature [ ] Other, please explain:

What changes did you make? (Give an overview)

For consistency with Node readable stream implementation, destroy() and end() should likely return this - https://nodejs.org/api/stream.html#readabledestroyerror

Context: https://github.com/DefinitelyTyped/DefinitelyTyped/pull/57473

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