(typescript) ported gocardless auth file to TS (#1941)

...es/desktop-client/src/components/modals/CreateAccount.tsx

packages/desktop-client/src/gocardless.ts

packages/desktop-client/src/hooks/useSyncServerStatus.ts

packages/loot-core/src/client/state-types/modals.d.ts

packages/loot-core/src/server/main.ts

packages/loot-core/src/types/models/gocardless.d.ts

packages/loot-core/src/types/models/index.d.ts

packages/loot-core/src/types/server-handlers.d.ts

upcoming-release-notes/1941.md