Data blobs

[ladvoc]

To support data tracks schema metadata (see #1553), this PR introduces a general purpose mechanism for storing large (in the order of KBs), arbitrary data blobs in a room that can be retrieved by other participants on demand.

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Latest commit: 27bebfd

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[boks1971]

lgtm! can we hold merging till integration on server side and getting feedback on server side changes? Just want to make sure if there are other changes, it will all be in one PR.

[boks1971]

lgtm! ✅ once the conflicts are resolved.