feat: Implement the promoter event creation

- Promoter can now create an event in draft mode
- Place is found based on address and long/lat are automatically
  deducted from it
- Slug is forged using the *slug* npm package instead of custom code

app/models/order.rb

@@ -1,6 +1,6 @@
 class Order < ApplicationRecord
   # === Constants ===
-  DRAFT_EXPIRY_TIME = 30.minutes
+  DRAFT_EXPIRY_TIME = 15.minutes
   MAX_PAYMENT_ATTEMPTS = 3
 
   # === Associations ===