FINERACT-2565: Batch API support for disburseToSavings, paySavingsAccountCharge, createAccountTransfer

[rhopman]

Add support for the following operations to the Fineract Batch API:

• Disburse a loan to a linked savings account (POST loans/{loanId}?command=disburseToSavings)
• Pay or waive a savings account charge (POST savingsaccounts/{savingsAccountId}/charges/{savingsAccountChargeId}?command=paycharge and ?command=waive)
• Create an account transfer (POST accounttransfers)

Checklist

• Write the commit message as per our guidelines
• Acknowledge that we will not review PRs that are not passing the build ("green") - it is your responsibility to get a proposed PR to pass the build, not primarily the project's maintainers.
• Create/update unit or integration tests for verifying the changes made.
• Follow our coding conventions.
• Add required Swagger annotation and update API documentation at fineract-provider/src/main/resources/static/legacy-docs/apiLive.htm with details of any API changes
• This PR must not be a "code dump". Large changes can be made in a branch, with assistance. Ask for help on the developer mailing list.