[supervisor] add http binding for create private ssh keys (#18405)

There is not grcp web client for Java.
I would like to use plain http request to resolve it
in order to establish SSH over Web Socket tunnel.

Author: akosyakov

components/supervisor-api/control.proto

@@ -6,6 +6,7 @@ syntax = "proto3";
 
 package supervisor;
 
+import "google/api/annotations.proto";
 import "status.proto";
 import "info.proto";
 
@@ -19,7 +20,11 @@ service ControlService {
   rpc ExposePort(ExposePortRequest) returns (ExposePortResponse) {}
 
   // CreateSSHKeyPair Create a pair of SSH Keys and put them in ~/.ssh/authorized_keys, this will only be generated once in the entire workspace lifecycle
-  rpc CreateSSHKeyPair(CreateSSHKeyPairRequest) returns (CreateSSHKeyPairResponse) {}
+  rpc CreateSSHKeyPair(CreateSSHKeyPairRequest) returns (CreateSSHKeyPairResponse) {
+    option (google.api.http) = {
+      get: "/v1/ssh_keys/create"
+  };
+  }
 
   // CreateDebugEnv creates a debug workspace envs
   rpc CreateDebugEnv(CreateDebugEnvRequest) returns (CreateDebugEnvResponse) {}