Consider sealing ArrowNativeType

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

The comments for Buffer::typed_data make the following point

    /// `ArrowNativeType` is public so that it can be used as a trait bound for other public
    /// components, such as the `ToByteSlice` trait.  However, this means that it can be
    /// implemented by user defined types, which it is not intended for.

Meaning that if some user crate implements ArrowNativeType for another type, using Buffer::typed_data (and others) will result in undefined behavior.

Describe the solution you'd like
Ensure users of the arrow crate can not impl ArrowNativeType

One way to do this would be to follow the sealed trait pattern here: https://rust-lang.github.io/api-guidelines/future-proofing.html

Additional context
This is extracted from a discussion with @jhorstmann on #996 (comment)