provide method to get tag name

[JosiahParry]

exif-rs provides the tag number but no way to get the tag name.

At present, the best path forward I can see as a user is to scape the EXIF tags at https://exiftool.org/TagNames/EXIF.html and create a lookup that I store as a const or lazy static in my crate.

It would be great if there were a better way to get the tag name.

[kamadak]

Tag implements std::fmt::Display, so try tag.to_string().