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/trc/src/ipc/mod.rs

@@ -0,0 +1,14 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ */
+
+pub mod bitset;
+pub mod channel;
+pub mod collector;
+pub mod metrics;
+pub mod subscriber;
+
+pub(crate) const USIZE_BITS: usize = std::mem::size_of::<usize>() * 8;
+pub(crate) const USIZE_BITS_MASK: usize = USIZE_BITS - 1;