Export Processor type to fix TypeScript errors

[astidolph]

Add export to the Processor type definition. This enables TypeScript support for addPostProcessor, addPreProcessor and addUploader which use the same type.

import Uppy from "@uppy/core";

const uppy = new Uppy();

// TS2339: Property 'addPostProcessor' does not exist on type 'Uppy'
uppy.addPostProcessor(async (fileIds) => {});

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Latest commit: a41fc1b

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