Add package declarations to stub files

fetch_request.go

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+package kafka

fetch_response.go

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+package kafka

offset_commit_request.go

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+package kafka

offset_commit_response.go

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+package kafka

offset_fetch_request.go

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+package kafka

offset_fetch_response.go

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+package kafka

offset_request.go

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+package kafka

offset_response.go

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+package kafka

produce_request.go

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+package kafka

produce_response.go

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+package kafka