Import upstream v0.16.22, stripped

Upstream commit: 474dd0229cb20cf513036619781ed97bd8073c3f
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 117 in 50 files
Dangling module declarations removed: 5
Cargo edits turning enterprise off: 14
Verification: clean
Enterprise feature gates left for rebuilt features: 19 in 18 files

Produced by tools/fork/strip.py. The full report is in docs/fork/strip-reports/ on main.

tests/resources/jmap/email_parse/attachment_b64.eml

@@ -0,0 +1,30 @@
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+
+--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: 7bit
+
+This is a message with a base64 encoded attached email
+--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+Content-Disposition: attachment; filename="attached_email.eml"
+Content-Type: message/rfc822
+Content-Transfer-Encoding: base64
+
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