Update Ledger schema with new Financial information

Purpose/Overview:
In order to support UIF-261

Requirements/Scope:

1. Addition set of fields need to be added.

Approach:
Update schema mod-finance/schemas/ledger.json with new fields:

Financial information

1. initialAllocation(readOnly) - The amount of the first allocation made to this budget (Summary of all related budgets)
2. allocationTo(readOnly) - The sum of all allocation transaction amounts made TO this budget not including the Initial allocation (Summary of all related budgets)
3. allocationFrom(readOnly) - The sum of all allocation transaction amounts made FROM this budget not including the Initial allocation (Summary of all related budgets)
4. totalFunding(readOnly) - budget.allocated + budget.netTransfers (Summary of all related budgets)
5. cashBalance(readOnly) - Total Funding minus Expended (Summary of all related budgets)
6. availableBalance(readOnly) - Total Funding minus Unavailable (Summary of all related budgets)
Note : A possible improvement is moving these fields to a separate container "financialInformation"

Financial activity & overages

1. encumbered(readOnly) - The sum of all encumbrance transaction amounts (Summary of all related budgets)
2. awaitingPayment(readOnly) - The sum of all pending payment amounts (Summary of all related budgets)
3. expenditures(readOnly) - The sum of all Payment amounts less credits (Summary of all related budgets)
4. overEncumbrance(readOnly) - The total amount encumbered minus the Total funding (Summary of all related budgets)
5. overExpended(readOnly) - The total amount expended minus the Total funding (Summary of all related budgets)

Acceptance criteria:

• Schema updated