[Woo POS] Improvement: Dashboard state handling

[iamgabrielma]

The current state of PointOfSaleDashboardView Is driven by multiple @Published booleans within PointOfSaleDashboardViewModel:

@Published var isInitialLoading: Bool = false
@Published var isError: Bool = false
@Published var isEmpty: Bool = false

While this currently works as expected, these states are mutually exclusive so it would make more sense to design as a single enum within the view model, so we do not risk to be in an incorrect state where two of more could be true at the same time. Eg:

enum DashboardState {
  case empty
  case initialLoading
  case error
 ...
}

[dangermattic]

Thanks for reporting! 👍