Support PUT for the Budget

Purpose/Overview:

Requirements/Scope:

1. Don't miss
   1.1 Add next calculated fields to org.folio.services.budget.BudgetService#mergeBudgets
   initialAllocation(persistent) - The amount of the first allocation made to this budget
   allocationTo(persistent) - The sum of all allocation transaction amounts made TO this budget not including the Initial allocation
   allocationFrom(persistent) - The sum of all allocation transaction amounts made FROM this budget not including the Initial allocation

Approach:
Update logic org.folio.services.budget.BudgetService#mergeBudgets

Acceptance criteria:

• Logic updated
• Update existed unit tests
• Update existed API tests : domain/mod-finance/features/budget-update.feature