Public API using private types: Buffer::from_bytes takes unexported Bytes

[tv42]

Describe the bug

https://docs.rs/arrow-buffer/53.2.0/arrow_buffer/buffer/struct.Buffer.html#method.from_bytes

/// Auxiliary method to create a new Buffer
pub fn from_bytes(bytes: Bytes) -> Self

This method is in the public API, but cannot be called.

Expected behavior

1. All types used by public API are public.

Any outside users looking at this are probably better served by Buffer::from_vec.

[tustvold]

We should probably make from_bytes crate private, agreed