[woocommerce] add widget parameters to allow several usecases

[levalleux-ludo]

• When showing the widget, it must be possible to show the redemption overview (1st page) or not.
• When an exchangeId is set, it must be possible to directly show:
  • the exchange details page (then the user can select an action depending on the exchange state)
  • or, the redeem form (assuming the exchange is in Committed state)
  • or, the cancel form (assuming the exchange is in Committed state)
  • or, the redeem confirmation form (delivery info is already known and only the redeem transaction will be sent)
• When showing the list of exchanges, it must be possible to preselect:
  • committed exchanges (default behaviour)
  • or, redeemed exchanges (useful when the buyer wants to raise a dispute on an exchange)
  • or, disputed exchanges (reserve)
  • or, completed exchanges (reserve)