2.6.6 SEPA Instant - SI Changes

Standing Instructions (SI) Support for SEPA Instant Outbound Transactions:

Introduced support for Standing Instructions (SI) in SEPA Instant outbound transactions.

Added a dedicated SI template screen for maintaining SEPA Instant instructions, including relevant validations during template creation.

Enhanced the common Template Summary screen to display SEPA Instant templates.

Provided a new REST service enabling addition, modification, deletion, and query operations for SEPA Instant templates.

Enabled SI creation and end-to-end SI processing for SEPA Instant transactions.