Use the `Linearization` dictionary, if it exists, when fetching the first Page
Use the `Linearization` dictionary, if it exists, when fetching the first Page

Since PDF.js already supports range requests and streaming, not to mention chunked rendering, attempting to use the `Linearization` dictionary in `PDFDocument.getPage` probably isn't going to improve performance in any noticeable way.
Nonetheless, when `Linearization` data is available, it will allow looking up the first Page *directly* without having to descend into the `Pages` tree to find the correct object.

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