Allow to import list of participants

[nickvergessen]

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E.g. CSV list of email,displayname to add many (at another place exported) participants easily

[Antreesy]

1. We do not currently have an API option for bulk adding of participants to reuse here (and during conversation creation).
2. Javascript should be able to generate CSV file for import/export, but if it's preferred to done on backend, also fine by me

Frontend:

Design note:

Participants setup dialog from conversation creation can be reused (to be called from Right Sidebar):

• Import option in three-dot-menu next to the searchbar (combined with dialpad button or separately?)
• Export option in the dialog footer (or also in three-dot menu?)

[nickvergessen]

but if it's preferred to done on backend

The target usecase is events with up to 2k participants. I don't think we should send 2k add-participants requests for that 🙈

[nickvergessen]

The export is most likely from another product, not from another chat/conversation in first place.
So not sure this makes sense to combine UI wise. Export needs to happen during/after a call/meeting.