Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

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+# Crossbeam Utils
+
+[![Build Status](https://github.com/crossbeam-rs/crossbeam/workflows/CI/badge.svg)](
+https://github.com/crossbeam-rs/crossbeam/actions)
+[![License](https://img.shields.io/badge/license-MIT_OR_Apache--2.0-blue.svg)](
+https://github.com/crossbeam-rs/crossbeam/tree/master/crossbeam-utils#license)
+[![Cargo](https://img.shields.io/crates/v/crossbeam-utils.svg)](
+https://crates.io/crates/crossbeam-utils)
+[![Documentation](https://docs.rs/crossbeam-utils/badge.svg)](
+https://docs.rs/crossbeam-utils)
+[![Rust 1.60+](https://img.shields.io/badge/rust-1.60+-lightgray.svg)](
+https://www.rust-lang.org)
+[![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.com/invite/JXYwgWZ)
+
+This crate provides miscellaneous tools for concurrent programming:
+
+#### Atomics
+
+* [`AtomicCell`], a thread-safe mutable memory location.<sup>(no_std)</sup>
+* [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering.<sup>(no_std)</sup>
+
+#### Thread synchronization
+
+* [`Parker`], a thread parking primitive.
+* [`ShardedLock`], a sharded reader-writer lock with fast concurrent reads.
+* [`WaitGroup`], for synchronizing the beginning or end of some computation.
+
+#### Utilities
+
+* [`Backoff`], for exponential backoff in spin loops.<sup>(no_std)</sup>
+* [`CachePadded`], for padding and aligning a value to the length of a cache line.<sup>(no_std)</sup>
+* [`scope`], for spawning threads that borrow local variables from the stack.
+
+*Features marked with <sup>(no_std)</sup> can be used in `no_std` environments.*<br/>
+
+[`AtomicCell`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/atomic/struct.AtomicCell.html
+[`AtomicConsume`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/atomic/trait.AtomicConsume.html
+[`Parker`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/sync/struct.Parker.html
+[`ShardedLock`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/sync/struct.ShardedLock.html
+[`WaitGroup`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/sync/struct.WaitGroup.html
+[`Backoff`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/struct.Backoff.html
+[`CachePadded`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/struct.CachePadded.html
+[`scope`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/thread/fn.scope.html
+
+## Usage
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+crossbeam-utils = "0.8"
+```
+
+## Compatibility
+
+Crossbeam Utils supports stable Rust releases going back at least six months,
+and every time the minimum supported Rust version is increased, a new minor
+version is released. Currently, the minimum supported Rust version is 1.60.
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+#### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.