Set up logic for starting following

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

crates/rpc/src/proto.rs

@@ -147,6 +147,8 @@ messages!(
     (BufferSaved, Foreground),
     (ChannelMessageSent, Foreground),
     (Error, Foreground),
+    (Follow, Foreground),
+    (FollowResponse, Foreground),
     (FormatBuffers, Foreground),
     (FormatBuffersResponse, Foreground),
     (GetChannelMessages, Foreground),
@@ -196,6 +198,7 @@ messages!(
     (SendChannelMessageResponse, Foreground),
     (ShareProject, Foreground),
     (Test, Foreground),
+    (Unfollow, Foreground),
     (UnregisterProject, Foreground),
     (UnregisterWorktree, Foreground),
     (UnshareProject, Foreground),
@@ -203,6 +206,7 @@ messages!(
     (UpdateBufferFile, Foreground),
     (UpdateContacts, Foreground),
     (UpdateDiagnosticSummary, Foreground),
+    (UpdateFollowers, Foreground),
     (UpdateWorktree, Foreground),
 );
 
@@ -212,6 +216,7 @@ request_messages!(
         ApplyCompletionAdditionalEdits,
         ApplyCompletionAdditionalEditsResponse
     ),
+    (Follow, FollowResponse),
     (FormatBuffers, FormatBuffersResponse),
     (GetChannelMessages, GetChannelMessagesResponse),
     (GetChannels, GetChannelsResponse),
@@ -248,6 +253,7 @@ entity_messages!(
     ApplyCompletionAdditionalEdits,
     BufferReloaded,
     BufferSaved,
+    Follow,
     FormatBuffers,
     GetCodeActions,
     GetCompletions,
@@ -266,11 +272,13 @@ entity_messages!(
     SaveBuffer,
     SearchProject,
     StartLanguageServer,
+    Unfollow,
     UnregisterWorktree,
     UnshareProject,
     UpdateBuffer,
     UpdateBufferFile,
     UpdateDiagnosticSummary,
+    UpdateFollowers,
     UpdateLanguageServer,
     RegisterWorktree,
     UpdateWorktree,