As others have said, there is probably no single platform now that does everything you're thinking of, but there are many that offer a subset of them. One that comes close is F1000Research.
There are widely-accepted terms for most of what you're describing; you can use those (and Google) to find platforms that offer them.
an open access journal / a platform that is free of charge for authors and readers
This is widely referred to as diamond open access. Of course, the funding (to run the servers, if nothing else) has to come from somewhere, so you'll need a plan for that.
offer the possibility to publish peer-reviewed articles, but also drafts, offer the possibility for reviewers to comment on drafts
What you're talking about here is (if I understand you correctly) widely referred to as open peer review (although that term is also used to mean more limited things).
offer spaces for videos and audios, and to share parts of our data in order to facilitate the replications of studies
This is often referred to as supplementary material, and very many journals allow this (for instance, the SIAM journals in my field). In most cases I know, this service is not yet widely used by authors or readers. There are also platforms designed specifically for this, like Figshare.
Finally, one part would be devoted to a space where researchers can build knowledge together, like some kind of wiki.
This is vague enough that I'm confident there are dozens, if not hundreds of similar efforts out there -- starting with Wikipedia itself. Perhaps one of the oldest efforts in this vein that is focused specifically on scientific research is the nLab.