refactor(library/init/classical.lean): move definition of some
refactor(library/init/classical.lean): move definition of some

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