WP_HTTP: Improve WP_HTTP::chunkTransferDecode() to properly handle binary data and chunked responses which include data in the page that looks like a chunked response.
This also fixes a case where the gzip'd data would become corrupt after chunked decoding as \r\n was replaced with \n in the data stream. Fixes #23463 

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WP_HTTP: Update the documentation regarding HTTP/1.1 support. Props leewillis77 Fixes #25074

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