feat(menu): create bl-menu component - dropdown like

[davidrus]

I'm submitting a ... (check one with "x")

[ ] bug report => search github for a similar issue or PR before submitting
[x] feature request
[ ] support request => You can submit support request here, but we preffer to chat about it realtime at our [ngParty slack](https://ngparty.herokuapp.com/)

Current behavior
We want to have DropdownButton like this dropdownButton

[Hotell]

consider this https://material.angular.io/components/component/menu

I think it's more appropriate then dropdown

also that label is quite messy. We should render selected item as content instead of label

[Hotell]

sry what we actually need is select https://material.angular.io/components/component/select

dropdown a.k.a menu should be different component, which isn't changing models or anything.

[davidrus]

@Hotell Create issue please

[Hotell]

will do