[10.0] Improve stripe statuses

[driesvints]

These changes sync the Stripe status within Cashier. This allows us to make better decisions when payments fail. There's also a new hasIncompletePayment method on both the billable trait and subscription model so it's easy to determine if a payment needs to be completed.

Subscriptions with an incomplete_expired status will be deleted from the app because they serve no purpose anymore.

[pierrocknroll]

Hello @driesvints
Since 'stripe_status' is a new column, it's not a problem for people who already have data in their table ? Do you recommend to do a script to fill the status of all current subscriptions ?

[driesvints]

@pierrocknroll technically using null in the beginning would be fine I believe but I suggest to sync with Stripe's statuses to be 100% sure everything's running okay. Your webhooks will begin updating your subscriptions normally but it's best if you do the first sync yourself.