Add extra options to better-auth client functions

[alex-delia]

1. Allows optional query params to be passed from the frontend with its success URL. This is useful for users with multiple clients using the same polar instance, ex. Web + Mobile. The extra data is passed to the successURL as a queryParam, where the developer can then redirect the users to the proper application.

2. Add redirect to portal options. Checkout already allows redirect to be specified on the frontend. With this change the portal can also specify this option and receive the link through authClient.portal()

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[pieterbeulque]

Appreciate the PR!

Just rolled out some minor changes that covers the same changes: you can now supply a succesUrl on the fly in authClient.checkout({ successUrl }) + await authClient.customer.portal({ redirect: false }) will now return the generated URL without redirecting!