Open budget DCA

[DuriSK]

Scenario: As user, I want to allocate 1000 USDT to HDX every 1 hour

• period - how often schedule should be repeated
• totalBudget - 0
• amountIn - amount for every repetition of schedule
• maxRetries - depends on user setting
• slippage - depends on user setting
  Routes should be prefilled to extrinsic like in normal DCA schedule