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Merge rust-bitcoin/rust-bitcoin#4071: chacha20: add benchmarks

<a class=hub.com/rust-bitcoin/rust-bitcoin/commit/<a class="double-link" href="https://git"><a class=hub.com/rust-bitcoin/rust-bitcoin/commit/e41653d18838e0d6e157db475b7b034b2456c924">e41653d18 add chacha20 benchmarks (jeremiah)

Pull request description:

  Add benchmarks for chacha20. These could be useful to understand future improvements.

  I copied the same 10, 1k and 64k sizes as used in the sha256 benchmark. Some of the lines changed here, such as in `Config.toml`, are a little mysterious to me as I am new to rust, so please check.

  ```
  ➜  chacha20_poly1305 git:(jr_chachabench) RUSTFLAGS='--cfg=bench' cargo +nightly bench
  ...
  test benches::chacha20_10  ... bench:         188.67 ns/iter (+/- 2.70) = 53 MB/s
  test benches::chacha20_1k  ... bench:       2,885.83 ns/iter (+/- 90.06) = 354 MB/s
  test benches::chacha20_64k ... bench:     186,493.88 ns/iter (+/- 5,074.53) = 351 MB/s
  ```

ACKs for top commit:
  apoelstra:
    ACK e41653d18838e0d6e157db475b7b034b2456c924; successfully ran local tests; nice!
  Kixunil:
    ACK e41653d18838e0d6e157db475b7b034b2456c924

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