feat(frontends/lean/builtin_cmds): track runtime
feat(frontends/lean/builtin_cmds): track runtime

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