[Sandbox] Add Wait and PID

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

runtime/v2/shim.go

@@ -194,6 +194,8 @@ type ShimProcess interface {
 	ID() string
 	// Namespace of this shim.
 	Namespace() string
+	// Bundle is a file system path to shim's bundle.
+	Bundle() string
 	// Client returns the underlying TTRPC client for this shim.
 	Client() *ttrpc.Client
 }
@@ -212,6 +214,10 @@ func (s *shim) Namespace() string {
 	return s.bundle.Namespace
 }
 
+func (s *shim) Bundle() string {
+	return s.bundle.Path
+}
+
 func (s *shim) Close() error {
 	return s.client.Close()
 }