feat(library/kernel_bindings): add normalize, whnf, type_check, infer_type methods to environment object Lua API
feat(library/kernel_bindings): add normalize, whnf, type_check, infer_type methods to environment object Lua API

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

UlrikBuchholtz/lean,digama0/lean,levnach/lean,digama0/lean,leodemoura/lean,leanprover-community/lean,soonhokong/travis_test,digama0/lean,leanprover-community/lean,fpvandoorn/lean,soonhokong/lean,Kha/lean,fpvandoorn/lean,sp3ctum/lean,leanprover/lean,levnach/lean,fgdorais/lean,rlewis1988/lean,digama0/lean,leanprover/lean,UlrikBuchholtz/lean,johoelzl/lean,fpvandoorn/lean,eigengrau/lean,fgdorais/lean,sp3ctum/lean,soonhokong/lean-osx,leanprover/lean,soonhokong/lean,eigengrau/lean,eigengrau/lean,soonhokong/lean-osx,sp3ctum/lean,dselsam/lean,leanprover-community/lean,c-cube/lean,rlewis1988/lean,c-cube/lean,Kha/lean,levnach/lean,johoelzl/lean,avigad/lean,rlewis1988/lean,UlrikBuchholtz/lean,digama0/lean,javra/lean,dselsam/lean,leanprover/lean,leodemoura/lean,javra/lean,leodemoura/lean,levnach/lean,soonhokong/lean,Kha/lean,soonhokong/travis_test,soonhokong/travis_test,htzh/lean,soonhokong/travis_test,johoelzl/lean,johoelzl/lean,leodemoura/lean,leodemoura/lean,javra/lean,Kha/lean,htzh/lean,c-cube/lean,fgdorais/lean,soonhokong/lean,soonhokong/lean,leanprover-community/lean,avigad/lean,fpvandoorn/lean2,fpvandoorn/lean,fgdorais/lean,soonhokong/lean-windows,eigengrau/lean,leanprover/lean,levnach/lean,htzh/lean,htzh/lean,leanprover/lean,fpvandoorn/lean2,dselsam/lean,soonhokong/lean-osx,dselsam/lean,leodemoura/lean,leanprover-community/lean,UlrikBuchholtz/lean,digama0/lean,fpvandoorn/lean2,soonhokong/lean-osx,fpvandoorn/lean,Kha/lean,rlewis1988/lean,javra/lean,johoelzl/lean,dselsam/lean,sp3ctum/lean,rlewis1988/lean,c-cube/lean,avigad/lean,javra/lean,htzh/lean,rlewis1988/lean,UlrikBuchholtz/lean,fgdorais/lean,fpvandoorn/lean2,fpvandoorn/lean2,sp3ctum/lean,soonhokong/lean-osx,avigad/lean,c-cube/lean,soonhokong/lean-windows,eigengrau/lean,soonhokong/lean-windows,fgdorais/lean,soonhokong/lean-windows,johoelzl/lean,soonhokong/lean-windows,avigad/lean,Kha/lean,dselsam/lean,avigad/lean,leanprover-community/lean,fpvandoorn/lean