Add benchmark for message decryption

test-data/message/text_from_alice_encrypted.eml

@@ -0,0 +1,87 @@
+Content-Type: multipart/encrypted; protocol="application/pgp-encrypted"; 
+	boundary="1858da4ad2d3c8a9_43c3a6383df12469_9f050814a95fd805"
+MIME-Version: 1.0
+From: <alice@example.org>
+To: <bob@example.net>
+Subject: [...]
+Date: Tue, 5 Aug 2025 11:07:50 +0000
+References: <0e547a9e-0785-421b-a867-ee204695fecc@localhost>
+Chat-Version: 1.0
+Autocrypt: addr=alice@example.org; prefer-encrypt=mutual; keydata=mDMEXlh13RYJKwYBBAHaRw8BAQdAzfVIAleCXMJrq8VeLlEVof6ITCviMktKjmcBKAu4m5
+	 C0GUFsaWNlIDxhbGljZUBleGFtcGxlLm9yZz7CkgQQFggAOgUCaJHmBRYhBC5vossjtTLXKGNLWGSw
+	 j2Gp7ZRDAhsDAh4BBQsJCAcCBhUKCQgLAgQWAgMBAScCGQEACgkQZLCPYantlENwpwEAq3zTDP9K1u
+	 pV6yNLz6F+ylJ9U0WFIglz/CRWEu8Ma6YBAOZxBxIEJ3QFcoYaZwNUQ7lKffFiyb0cgA7hQM2cokMN
+	 uDgEXlh13RIKKwYBBAGXVQEFAQEHQAbtyNbLZIUBTwqeW2W5tVbrusWLJ+nTUmtF7perLbYdAwEIB8
+	 J4BBgWCAAgBQJokeYFAhsMFiEELm+iyyO1MtcoY0tYZLCPYantlEMACgkQZLCPYantlENQgQD8CTIi
+	 nPoPpFmnGuLXMOBH8PEDxTL+RQJgUms3dpkj2MUA/iB3L8TEtOC4A2eu5XAHttLrF3GYo7dlTq4LfO
+	 oJtmIC
+
+
+--1858da4ad2d3c8a9_43c3a6383df12469_9f050814a95fd805
+Content-Type: application/pgp-encrypted; charset="utf-8"
+Content-Description: PGP/MIME version identification
+Content-Transfer-Encoding: 7bit
+
+Version: 1
+
+--1858da4ad2d3c8a9_43c3a6383df12469_9f050814a95fd805
+Content-Type: application/octet-stream; name="encrypted.asc"; 
+	charset="utf-8"
+Content-Description: OpenPGP encrypted message
+Content-Disposition: inline; filename="encrypted.asc";
+Content-Transfer-Encoding: 7bit
+
+-----BEGIN PGP MESSAGE-----
+
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+CQT/U3+zTJlTSH5hLvLv0sZ6AeV7U983n4JkFsz2t0wqmpIHrjP/Q4dJ62L8EfLm
+n+3y/w1MagdbjeiCBAevclH5F/E/kL5b2wc7TXrLFbKPe9juK8xddysX3do35PGH
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+5DxNi7yKWZfMxVd5hBdOznGMsbaw4WqT516Hj5/Xb8ZtXjneatdX6aQGtJimgEC3
+WMCqmY1n/iqa/K9auFbbfxPoMkFNZChKtje0azqmPnlvDgAzG0n80446D/xbC4UZ
+zcpw7Sug6Mi2heI0/Y8uvyTtVRaO2ZxTA2dt8RTFQbunhvIze8MDrscz3TTIZds+
+TelyYEETPJbxbjT0z34oGDY3nXfNAZalnmceHCsAYOw61BdlJ/2reQyxDjuZRPn7
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++klDI0Uf/SrrOAEc5AY6KhvqjQRsLpOC4dDkrXTfxxm6XqDxXTk4lgH0tuSPTFRw
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+XmVFQs4m3hG4wx3f7SPtx0/+z+AkgTUzCuudvV+oLxbbq+7ZvTcYZoe36Bm/CIgM
+t97rNeC3oXS+aIHEk6LU9ER+/7eI5R7jNY/c4K111DQu7o+cM3dxF08r+iUu8lR0
+O8C0FM6a45PcOsaIanFiTgv238UCkb9vwjXrJI572tjOCKHSXrhIEweKziq1bU4q
+0tDEbUG5dRZk87HI8Vh1JNei8V8Nyq6A7XfHV3WBxgNWvjUCgIx/SCzitbg=
+=indJ
+-----END PGP MESSAGE-----
+
+
+--1858da4ad2d3c8a9_43c3a6383df12469_9f050814a95fd805--
+

test-data/message/text_symmetrically_encrypted.eml

@@ -0,0 +1,56 @@
+Content-Type: multipart/encrypted; protocol="application/pgp-encrypted"; 
+	boundary="1858db5a667e9817_308656fa7edcc46c_c8ec5a6c260b51bc"
+MIME-Version: 1.0
+From: <alice@example.org>
+To: "hidden-recipients": ;
+Subject: [...]
+Date: Tue, 5 Aug 2025 11:27:17 +0000
+Message-ID: <5f9a3e21-fbbd-43aa-9638-1927da98b772@localhost>
+References: <5f9a3e21-fbbd-43aa-9638-1927da98b772@localhost>
+Chat-Version: 1.0
+Autocrypt: addr=alice@example.org; prefer-encrypt=mutual; keydata=mDMEXlh13RYJKwYBBAHaRw8BAQdAzfVIAleCXMJrq8VeLlEVof6ITCviMktKjmcBKAu4m5
+	 C0GUFsaWNlIDxhbGljZUBleGFtcGxlLm9yZz7CkgQQFggAOgUCaJHqlBYhBC5vossjtTLXKGNLWGSw
+	 j2Gp7ZRDAhsDAh4BBQsJCAcCBhUKCQgLAgQWAgMBAScCGQEACgkQZLCPYantlEM55QD9H8bPo4J8Yz
+	 TlMuMQms7o7rW89FYX+WH//0IDbfgWysAA/2lDEwfcP0ufyJPvUMGUi62JcFS9LBwS0riKGpC6hiMM
+	 uDgEXlh13RIKKwYBBAGXVQEFAQEHQAbtyNbLZIUBTwqeW2W5tVbrusWLJ+nTUmtF7perLbYdAwEIB8
+	 J4BBgWCAAgBQJokeqUAhsMFiEELm+iyyO1MtcoY0tYZLCPYantlEMACgkQZLCPYantlEPdsAEA8cjS
+	 XsAtWnQtW6m7Yn53j5Wk+jl5b3plydWhh8kk8uAA/2gx7wuDYDW9V32NdacJFV2H7UtItsTjN3qp8f
+	 l00TQB
+
+
+--1858db5a667e9817_308656fa7edcc46c_c8ec5a6c260b51bc
+Content-Type: application/pgp-encrypted; charset="utf-8"
+Content-Description: PGP/MIME version identification
+Content-Transfer-Encoding: 7bit
+
+Version: 1
+
+--1858db5a667e9817_308656fa7edcc46c_c8ec5a6c260b51bc
+Content-Type: application/octet-stream; name="encrypted.asc"; 
+	charset="utf-8"
+Content-Description: OpenPGP encrypted message
+Content-Disposition: inline; filename="encrypted.asc";
+Content-Transfer-Encoding: 7bit
+
+-----BEGIN PGP MESSAGE-----
+
+wz4GHAcCCgEI44vuKOnsZubFQrI4MW7LbfmxKq5N2VIQ8c2CIRIAnvAa3AMV3Deq
+P69ilwwDCf2NRy8Xg42Dc9LBkAIHAgdRy6G2xao09tPMEBBhY9dF01x21w+MyWd4
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+zxXzeY7woy+vjRPCFJCxWRrZ20cDQzs5pnrjapxS8j72ByQ=
+=SwRI
+-----END PGP MESSAGE-----
+
+
+--1858db5a667e9817_308656fa7edcc46c_c8ec5a6c260b51bc--
+