Initial import of tokio_stream am: c0f49ebcec

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tokio-stream/+/1558921

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I15fea460ae433ca839c7f7631008997d2e0b67ac
tree: 08efa1ccbef1a7ef36c8b30afc594f438eecffd9
  1. CHANGELOG.md
  2. Cargo.toml
  3. Cargo.toml.orig
  4. src/
  5. tests/