feat(data): Make Tag::numeric, Tag::from public

shimunnrequested to merge
shimunn/minicbor:tag-numeric-pub into develop

Hi,

I'm currently devloping on a library for an dataformat based on CBOR and decided to use minibor for serialization, which has been grreat so far. However I would like to expose the CBOR tags I'm using as integer constants as part of the lib. However that is made quite cumbersome due to the way minicbor implements tags since the data::Tag enum cannot be controverted to and from u64 apart from the Tag::Unassigned variant. Since I don't see any reason why this conversion Api has to stay private I would propose to make the relevant function public.

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