Sxian/clt 2522/add protocol version to participant info

[xianshijing-lk]

The clients will use the protocol_version to decide:
1, if we should use the streamed response for RPC messages
2, if RPC can use compression for large messages

And it will help being backward compatible with older versions

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[1egoman]

Maybe this should be uint32?

[lukasIO]

In order to support setting the version at connection time (informing the SFU) it will have to be added also to ClientInfo here

protocol/protobufs/livekit_models.proto

Lines 528 to 529 in 2bb10a5

	int32 protocol = 3;
	string os = 4;

I'm not sure if protocol_version is the right name given we have protocol and agent_protocol already as existing fields. Maybe something like client_protocol instead?