Changes to List Accounts

added accounts.AccountExternal to the allOf[subschema #2]/results/items response property oneOf list for the response status 200

added external discriminator mapping keys to the allOf[subschema #2]/results/items response property for the response status 200

added the required property allOf[subschema #2]/results/items/oneOf[subschema #1: Account (Bank)]/allOf[#/components/schemas/accounts.CommonAccount]/type to the response with the 200 status

added the required property allOf[subschema #2]/results/items/oneOf[subschema #2: Account (Balance)]/allOf[#/components/schemas/accounts.CommonAccount]/type to the response with the 200 status

added the required property allOf[subschema #2]/results/items/oneOf[subschema #3: Account (PayPal) -> subschema #4: Account (PayPal)]/allOf[#/components/schemas/accounts.CommonAccount]/type to the response with the 200 status