chore: add venv helper and grpc dependencies (GoogleCloudPlatform#1445)

This PR contains the build script changes required to enable the E2E tests.

Author: hessjcg

build.sh

@@ -150,6 +150,11 @@ function write_e2e_env(){
 
 }
 
+## with_venv - runs a command with the venv activated
+function with_venv() {
+  "$@"
+}
+
 ## help - prints the help details
 ##
 function help() {

pyproject.toml

@@ -46,6 +46,9 @@ dependencies = [
     "dnspython>=2.0.0",
     "Requests",
     "google-auth>=2.28.0",
+    "grpcio",
+    "protobuf",
+    "googleapis-common-protos",
 ]
 dynamic = ["version"]