Protobus Host Bridge (#3747)

* WIP host bridge

* Run formatter

* remove tmp impl & rename host grpc client

* gitignore more files

* better layout

* host handler to make other hosts easier to add

* remove adapter pattern

* get host responses correctly

* fix streaming mode for host bridge

* first wip subscription host bridge demo for watching mcp server config

* format, comment

* add cancellation for host grpc stream

* remove unneeded functions from host-grpc-handler

* add a method for canceling request rather than using the registry

* another todo

* use StringRequest for uri.proto

* debounce new file watcher

* remove test setup

* remove some todos and logs

* remove registry use todo

* Revert "remove registry use todo"

This reverts commit 84078d3469.

* fix capitalization of uri.proto

* a better pattern for a callback based bridge without using the requestRegistry directly

---------

Co-authored-by: Andrei Edell <andrei@nugbase.com>
Co-authored-by: Sarah Fortune <sarah.fortune@gmail.com>
Co-authored-by: Andrei Eternal <eternal@cline.bot>

proto/host/uri.proto

@@ -0,0 +1,36 @@
+syntax = "proto3";
+
+package host;
+option java_package = "bot.cline.host.proto";
+option java_multiple_files = true;
+
+import "common.proto";
+
+// UriService provides methods for working with URIs in the IDE
+service UriService {
+  // Create a new file URI from a file path
+  rpc file(cline.StringRequest) returns (Uri);
+  
+  // Join a URI with additional path segments
+  rpc joinPath(JoinPathRequest) returns (Uri);
+  
+  // Parse a string URI into a Uri object
+  rpc parse(cline.StringRequest) returns (Uri);
+}
+
+// Uri represents a URI in the IDE
+message Uri {
+  string scheme = 1;
+  string authority = 2;
+  string path = 3;
+  string query = 4;
+  string fragment = 5;
+  string fsPath = 6;
+}
+
+// Request for joining path segments to a URI
+message JoinPathRequest {
+  cline.Metadata metadata = 1;
+  Uri base = 2;
+  repeated string pathSegments = 3;
+}

proto/host/watch.proto

@@ -0,0 +1,32 @@
+syntax = "proto3";
+
+package host;
+option java_package = "bot.cline.host.proto";
+option java_multiple_files = true;
+
+import "common.proto";
+
+// WatchService provides methods for watching files in the IDE
+service WatchService {
+  // Subscribe to file changes
+  rpc subscribeToFile(SubscribeToFileRequest) returns (stream FileChangeEvent);
+}
+
+// Request to subscribe to file changes
+message SubscribeToFileRequest {
+  cline.Metadata metadata = 1;
+  string path = 2;
+}
+
+// Event representing a file change
+message FileChangeEvent {
+  enum ChangeType {
+    CREATED = 0;
+    CHANGED = 1;
+    DELETED = 2;
+  }
+  
+  string path = 1;
+  ChangeType type = 2;
+  string content = 3; // Optional content of the file after change
+}