Rumble video embed like what was added for Youtube

[cointastical]

Rumble is a video hosting network that is gaining in popularity, not just because of its monetization feature (i.e., payouts to creators) but but also because it is the relatively common destination for those who suffered from having their Youtube account terminated (censorship).

This request is to add support for a Post for a link that is a Rumble video to include either the javascript embed or the iframe embed so that the video can be played within the SN post, similarly to how there is now Youtube embed, and Twitter embed support in SN (see Issue https://github.com/stackernews/stacker.news/issues/9).

[cointastical]

There's also a similar, related, issue: #107 (for embed of Peertube)

[cointastical]

This feature request was discussed on SN, Item #18804.