feat: Guess message viewtype from "application/octet-stream" attachment extension (#4378)

test-data/message/jpeg-as-application-octet-stream.eml

@@ -0,0 +1,76 @@
+X-Mozilla-Status: 0801
+X-Mozilla-Status2: 10000000
+Content-Type: multipart/mixed; boundary="------------L1v4sF5IlAZ0HirXymXElgpK"
+Message-ID: <1e3b3bb0-f34f-71e2-6b86-bce80bef2c6f@example.org>
+Date: Thu, 3 Aug 2023 13:31:01 -0300
+MIME-Version: 1.0
+User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
+ Thunderbird/102.13.0
+Content-Language: en-US
+To: bob@example.net
+From: Alice <alice@example.org>
+X-Identity-Key: id3
+Fcc: imap://alice%40example.org@in.example.org/Sent
+
+This is a multi-part message in MIME format.
+--------------L1v4sF5IlAZ0HirXymXElgpK
+Content-Type: text/plain; charset=UTF-8; format=flowed
+Content-Transfer-Encoding: 7bit
+
+
+--------------L1v4sF5IlAZ0HirXymXElgpK
+Content-Type: application/octet-stream; name="rusty_deltachat_logo.jpeg"
+Content-Disposition: attachment; filename="rusty_deltachat_logo.jpeg"
+Content-Transfer-Encoding: base64
+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+
+--------------L1v4sF5IlAZ0HirXymXElgpK--