[prototype] ImageDtype trait to implement resize for various dtypes

[gau-nernst]

This is my prototype to support resize with different dtypes. Justifications for trait

• Copy trait: to get the value out of ndarray::Array<T, _>
• Default trait: to get 0 value
• Into<f32> trait: to convert to f32 for internal computation i.e. bilinear/bicubic
• Send and Sync trait: required for ndarray::Zip::par_for_each()
• from_f32() function: convert from internal computation dtype f32 back to original dtype. We can't use From<f32> since it is undefined-behavior with underflow and overflow values i.e. we need to clamp the value by ourselves.

I think ImageDtype trait can be moved to image.rs and data within Image must implement ImageDtype trait i.e. these are the dtype that we support -> pub struct Image<T: ImageDtype, const CHANNELS: usize>

[edgarriba]

Let’s somehow verify we don’t break anything , maybe add different types test