Drink suggestion by type filter

[TomSeldon]

Add support to suggest a drink based on type, e.g.

Alexa, ask Tiny Rebel to suggest an IPA
Alexa, ask Tiny Rebel to suggest a pale ale
Alexa, ask Tiny Rebel to suggest a cider

This involves:

• Adding new intent with DrinkType slot
• Handling bar location (either via dialogue, or via extra slot, though that could be too wordy)
• Filter drinks by drink type slot value. This is more complicated than drinks.dinkType === drinkTypeSlot as certain types overlap (e.g "IPA" should match "Pale Ale"). Need to think of best way of matching these.