Differentiate between follow state on a per-project basis

crates/rpc/proto/zed.proto

@@ -231,6 +231,7 @@ message ParticipantProject {
 message Follower {
     PeerId leader_id = 1;
     PeerId follower_id = 2;
+    uint64 project_id = 3;
 }
 
 message ParticipantLocation {

crates/rpc/src/rpc.rs

@@ -6,4 +6,4 @@ pub use conn::Connection;
 pub use peer::*;
 mod macros;
 
-pub const PROTOCOL_VERSION: u32 = 48;
+pub const PROTOCOL_VERSION: u32 = 49;