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/src/lib.rs

@@ -0,0 +1,38 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ */
+
+#![warn(clippy::large_futures)]
+
+use std::sync::LazyLock;
+
+use imap_proto::{ResponseCode, StatusResponse, protocol::capability::Capability};
+
+pub mod core;
+pub mod op;
+
+static SERVER_GREETING: &str = "Stalwart IMAP4rev2 at your service.";
+
+pub(crate) static GREETING_WITH_TLS: LazyLock<Vec<u8>> =
+    LazyLock::new(|| build_greeting(true, true));
+
+pub(crate) static GREETING_WITH_TLS_LOGIN_DISABLED: LazyLock<Vec<u8>> =
+    LazyLock::new(|| build_greeting(true, false));
+
+pub(crate) static GREETING_WITHOUT_TLS: LazyLock<Vec<u8>> =
+    LazyLock::new(|| build_greeting(false, true));
+
+pub(crate) static GREETING_WITHOUT_TLS_LOGIN_DISABLED: LazyLock<Vec<u8>> =
+    LazyLock::new(|| build_greeting(false, false));
+
+fn build_greeting(offer_tls: bool, allow_auth: bool) -> Vec<u8> {
+    StatusResponse::ok(SERVER_GREETING)
+        .with_code(ResponseCode::Capability {
+            capabilities: Capability::all_capabilities(false, offer_tls, allow_auth, 0, 0),
+        })
+        .into_bytes()
+}
+
+pub struct ImapError;