fix(library/class): attributes `instance` and `class` were not being registered in the attribute_manager when procedures add_instance and add_class were being used directly
fix(library/class): attributes `instance` and `class` were not being registered in the attribute_manager when procedures add_instance and add_class were being used directly

johoelzl/lean,Kha/lean,rlewis1988/lean,leodemoura/lean,leanprover-community/lean,leanprover-community/lean,rlewis1988/lean,Kha/lean,fgdorais/lean,leodemoura/lean,digama0/lean,avigad/lean,avigad/lean,leanprover/lean,Kha/lean,Kha/lean,avigad/lean,fpvandoorn/lean,dselsam/lean,leanprover/lean,leanprover/lean,digama0/lean,leodemoura/lean,fgdorais/lean,leanprover-community/lean,leanprover-community/lean,fpvandoorn/lean,leanprover/lean,dselsam/lean,fgdorais/lean,rlewis1988/lean,leodemoura/lean,fgdorais/lean,digama0/lean,leanprover/lean,johoelzl/lean,avigad/lean,fpvandoorn/lean,johoelzl/lean,dselsam/lean,fgdorais/lean,digama0/lean,leodemoura/lean,johoelzl/lean,fgdorais/lean,rlewis1988/lean,fpvandoorn/lean,rlewis1988/lean,fpvandoorn/lean,leanprover-community/lean,digama0/lean,dselsam/lean,johoelzl/lean,leodemoura/lean,dselsam/lean,digama0/lean,dselsam/lean,Kha/lean,avigad/lean,johoelzl/lean,leanprover-community/lean,Kha/lean,avigad/lean,rlewis1988/lean,fpvandoorn/lean,leanprover/lean