feat(rpc/room): add ListParticipants and GetParticipant

[sohbit]

Changes

Add ListParticipants and GetParticipant RPCs to the Room PSRPC service, following the same topic-based routing pattern as:

• DeleteRoom,
• SendData,
• and UpdateRoomMetadata.

These are needed so the livekit server can route participant read operations to the authoritative RTC node instead of reading from eventually-consistent Redis.

No breaking changes for existing UnimplementedRoomServer embedders (new methods have default stubs).

Dependencies

The following fix on livekit/livekit expects these changes:

• fix(roomservice): route participant reads through PSRPC instead of Redis livekit#4373

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