Tracking issue: impl `AsyncReadRent` and `AsyncWriteRent` for in-memory std buffer types

Is your feature request related to a problem? Please describe.

I want to have AsyncReadRent and AsyncWriteRent implemented for in-memory std buffer types, like Vec<u8>, Cursor for testing purposes.

Describe the solution you'd like

Similar to what Tokio does:

• write: https://docs.rs/tokio/latest/tokio/io/trait.AsyncWrite.html#foreign-impls
  • Vec<u8>
  • Cursor<&mut Vec<u8>>
  • Cursor<&mut [u8]>
  • Cursor<Box<[u8]>>
  • Cursor<Vec<u8>>
  • &mut T
  • Box<T>
• read: https://docs.rs/tokio/latest/tokio/io/trait.AsyncRead.html#foreign-impls
  • &[u8]
  • Cursor<T>
  • &mut [T]
  • Box<T>

Describe alternatives you've considered

No

Additional context

AsyncReadRent has been implemented for &[u8]