Move ProtoClient to RPC crate, behind feature flag disabled in collab (#17908)

This fixes a bug where we accidentally added a `gpui` transitive
dependency in `collab`.

Release Notes:

- N/A

crates/project/src/buffer_store.rs

@@ -17,10 +17,7 @@ use language::{
     proto::{deserialize_line_ending, deserialize_version, serialize_version, split_operations},
     Buffer, Capability, Event as BufferEvent, File as _, Language, Operation,
 };
-use rpc::{
-    proto::{self, AnyProtoClient},
-    ErrorExt as _, TypedEnvelope,
-};
+use rpc::{proto, AnyProtoClient, ErrorExt as _, TypedEnvelope};
 use smol::channel::Receiver;
 use std::{io, path::Path, str::FromStr as _, sync::Arc, time::Instant};
 use text::BufferId;

crates/project/src/lsp_store.rs

@@ -49,7 +49,7 @@ use parking_lot::{Mutex, RwLock};
 use postage::watch;
 use rand::prelude::*;
 
-use rpc::proto::AnyProtoClient;
+use rpc::AnyProtoClient;
 use serde::Serialize;
 use settings::{Settings, SettingsLocation, SettingsStore};
 use sha2::{Digest, Sha256};

crates/project/src/project.rs

@@ -62,10 +62,7 @@ use paths::{local_tasks_file_relative_path, local_vscode_tasks_file_relative_pat
 use prettier_support::{DefaultPrettier, PrettierInstance};
 use project_settings::{LspSettings, ProjectSettings, SettingsObserver};
 use remote::SshSession;
-use rpc::{
-    proto::{AnyProtoClient, SSH_PROJECT_ID},
-    ErrorCode,
-};
+use rpc::{proto::SSH_PROJECT_ID, AnyProtoClient, ErrorCode};
 use search::{SearchInputKind, SearchQuery, SearchResult};
 use search_history::SearchHistory;
 use settings::{watch_config_file, Settings, SettingsLocation, SettingsStore};

crates/project/src/project_settings.rs

@@ -2,10 +2,7 @@ use collections::HashMap;
 use fs::Fs;
 use gpui::{AppContext, AsyncAppContext, BorrowAppContext, Model, ModelContext};
 use paths::local_settings_file_relative_path;
-use rpc::{
-    proto::{self, AnyProtoClient},
-    TypedEnvelope,
-};
+use rpc::{proto, AnyProtoClient, TypedEnvelope};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use settings::{Settings, SettingsSources, SettingsStore};

crates/project/src/worktree_store.rs

@@ -17,8 +17,8 @@ use gpui::{
 };
 use postage::oneshot;
 use rpc::{
-    proto::{self, AnyProtoClient, SSH_PROJECT_ID},
-    TypedEnvelope,
+    proto::{self, SSH_PROJECT_ID},
+    AnyProtoClient, TypedEnvelope,
 };
 use smol::{
     channel::{Receiver, Sender},