add missing imports

Author: rnro

Sources/GRPCCodeGen/CodeGenerationRequest.swift

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import Foundation
+
 /// Describes the services, dependencies and trivia from an IDL file,
 /// and the IDL itself through its specific serializer and deserializer.
 public struct CodeGenerationRequest {

Sources/GRPCCodeGen/Internal/Translator/Docs.swift

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import Foundation
+
 package enum Docs {
   package static func suffix(_ header: String, withDocs footer: String) -> String {
     if footer.isEmpty {