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.

crates/imap-proto/src/protocol/append.rs

@@ -0,0 +1,21 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ */
+
+use super::Flag;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Arguments {
+    pub tag: String,
+    pub mailbox_name: String,
+    pub messages: Vec<Message>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Message {
+    pub message: Vec<u8>,
+    pub flags: Vec<Flag>,
+    pub received_at: Option<i64>,
+}