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>

.gitignore

@@ -22,9 +22,18 @@ coverage
 *evals.env
 
 # Generated proto files
-src/shared/proto/*.ts
 src/core/controller/*/methods.ts
 src/core/controller/*/index.ts
 src/core/controller/grpc-service-config.ts
+# Shared
+src/shared/proto/*.ts
+src/shared/proto/host/*.ts
+# Webview
 webview-ui/src/services/grpc-client.ts
+# Standalone
 src/standalone/server-setup.ts
+src/standalone/services/host-grpc-client.ts
+# Host bridge
+hosts/vscode/*/methods.ts
+hosts/vscode/*/index.ts
+hosts/vscode/host-grpc-service-config.ts