Allow integrations to control redirect

[slogsdon]

Current implementation for embedded/lightbox options forces a redirect to occur. Ideally, integrations should be able to control this behavior to adapt to any workflows they deem necessary. This is especially useful in integrations that want to control the experience client-side before passing control to the server-side.

[bpuig]

+1

[zxfrank]

I just finished to manage this. It's not perfect but do the job. I created a PR see above, if you have any question let me know