⚙️ IFRAME support - Allow to embed <iFrames>

An "IFRAME" or "HTML" helper that allows embedding IFrames

Most webtools, including many other LTD tools allow to create iframes and embed them in other places, so this would make Boei instantly compatible with 1000's of these other webtools. (it would also allow Ruben in future to see which tool iframes people would use the most, and allow Boei to be marketed as being compatible with them, possibly reaching/attracting more future customers)

It would be a great addition to the "Other" helper types, and make it possible to add videos (Youtube or google drive videos)
Knowledgebases , Embeding Notion pages, terms and conditions from platforms like Iubenda, calculators, other/third party contact forms) and much much more.

For example:
For my particular use case, I would like to use feedback forms from Feedier (which you can place anywhere because you can create iFrames from them) in place of Boei feedback, because I already use it and since it's a feedback-oriented product it naturally has many more features and allows me much more power. The best of all is that it will allows me to keep my feedback form consistent throughout my website and the biggest advantage of all, it will allow me to gather all the results in the same location/platform.

Boei is already quite versatile, this seems to just make sense!