stream: Fix chunking sensitivity.

This is a breaking change that will cause the major version to be
bumped.

- Rewrite `SeaHasher` to use its own inner state instead of the one in
`buffer.rs`
- Add tests for chunking for stream hashing
- Add tests for ensuring the same result for streaming and block hashing
- Add benchmark for stream hashing
- Change `...` to `..=` in `buffer.rs`
1 job for fix_chunking in 18 seconds
Status Job ID Name Coverage
  Test
passed #24824
test:cargo

00:00:18