Separation of a decoding function crate #126
Description
Motivation
The decoding (sections 5, 6, and 7 unpacking) implementation is the part of the grib crate that I have been working on for the longest time, and it is sufficiently mature, but it is currently closely tied to the internal data structure of the grib crate.
Proposed Solution
It would be preferable to separate it into a simple crate, provide an easy-to-use API, and call it from the grib crate through that API.
Additional Context
Due to personal necessity, I have already begun implementing packing functions for some encoding methods. It would be good to include this as well.