refactor(bril-rs)!: Use a standalone struct for a concrete label
#350
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Rationale
It would be useful to refer to a
Labelobject in source code usingbril-rsas a library. This can also be done on the user-level by transformingCode::Labelinto an appropriate user-definedstruct, so I can close this PR if this path is intended.Changes
Code::Labelvariant in the representation of a concrete program to instead hold a newLabelstruct, which contains the same information as the variant. This newstructalso implements the same traits and other properties as the other items.0.2to reflect this breaking change.