feat(frontends/lean/structure_cmd): allow local notations
feat(frontends/lean/structure_cmd): allow local notations

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