Vendor dependencies

Let's see how I like this workflow.

vendor/unicode-ident/tests/trie/mod.rs

@@ -0,0 +1,7 @@
+#![allow(clippy::module_inception)]
+
+#[allow(dead_code, clippy::redundant_static_lifetimes, clippy::unreadable_literal)]
+#[rustfmt::skip]
+mod trie;
+
+pub(crate) use self::trie::*;