feat(compiler/lambda_lifting): add support for cases_on recursor
feat(compiler/lambda_lifting): add support for cases_on recursor

We still have to implement support for the recursive case.

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