feat(merchant_account_v2): add merchant_account_v2 domain and diesel models (#5365)
Co-authored-by: hrithikesh026 <hrithikesh.vm@juspay.in>
Co-authored-by: Prajjwal Kumar <prajjwal.kumar@juspay.in>
Co-authored-by: Sanchith Hegde <sanchith.hegde@juspay.in>
Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>
