refactor(router): modify `net_amount` to be a struct in the domain model of payment_attempt and handle amount changes across all flows (#6252)
Co-authored-by: swangi-kumari <swangi.12015941@lpu.in>
Co-authored-by: Swangi Kumari <85639103+swangi-kumari@users.noreply.github.com>
Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>