E2EE HKDF & keyring_size support

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Hi I've been trying to implement MatrixRTC over LiveKit in rust for use in matrix-jukebox.

The spec says to use HKDF for per-participant keys, but from what I can tell the rust sdk only ever does PBKDF2. The Javascript implementation also sets the keyring-size which as far as I can tell can't be set from Rust at the moment.

Is support for this planned?

[onestacked]

friendly ping @theomonnom and @cloudwebrtc