This commit adds an optional new stripe based pricing table.
If the user is logged in, the email field will be prepopulated with the users email.
The pricing table can be configured in the stripe dashboard.
Once the discourse_subscriptions_pricing_table setting is filled with the pricing table embed code from the stripe dashboard,
the pricing table will be displayed on /s/subscriptions
For more details see https://stripe.com/docs/payments/checkout/pricing-table
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Co-authored-by: spirobel <[email protected]>
Blake Ericksonandspirobel
Natalie Tay
Loïc Guitaut