Cancel invoice : create logic to support invoice cancel operation

Purpose/Overview:
In order to cancel an invoice we need to be able to Void the associated transactions. ie. payments, credits, pending payments. Meaning we might need a status of "Void" which basically tells the system to ignore these transactions. They will no longer count towards budgets and budget totals need to be updated. However, they will still appear in the transaction list so it is clear that they were voided.
Also invoice, invoice lines and vouchers should have status "Cancelled"

Approach:

• Implement invoice status transition handler for cancelled invoices within InvoiceCancellService.java
• Mark releated invoice lines and vouchers as Cancelled
• Update payments/credits and pending payments field by setting invoiceCancelled = true

Implement requests in following order:
1. update transactions summaries
2. set all pending payment cancelled
3. set all payments/credits cancelled
4. set all invoice lines canceled
5. set all vouchers cancelled

Acceptance criteria:

• Logic updated
• Unit tests created
• API test created