chore: add vendor directory

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diff --git a/vendor/sync_wrapper/README.md b/vendor/sync_wrapper/README.md
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+[![Latest Version](https://img.shields.io/crates/v/sync_wrapper.svg)](https://crates.io/crates/sync_wrapper)
+[![Rust Documentation](https://docs.rs/sync_wrapper/badge.svg)](https://docs.rs/sync_wrapper)
+
+# SyncWrapper
+
+A mutual exclusion primitive that relies on static type information only.
+
+This library is inspired by [this discussion](https://internals.rust-lang.org/t/what-shall-sync-mean-across-an-await/12020/2).