fix: add missing dependencies in Gradle for "self-service" library generation (#884)

Author: chanseokoh

rules_java_gapic/resources/gradle/client_grpc.gradle.tmpl

@@ -10,6 +10,8 @@ dependencies {
   testImplementation 'com.google.api:gax:{{version.gax}}:testlib'
   implementation 'com.google.api:gax-grpc:{{version.gax_grpc}}'
   testImplementation 'com.google.api:gax-grpc:{{version.gax_grpc}}:testlib'
+  implementation 'io.grpc:grpc-protobuf:{{version.io_grpc}}'
+  testImplementation 'io.grpc:grpc-stub:{{version.io_grpc}}'
   testImplementation 'io.grpc:grpc-netty-shaded:{{version.io_grpc}}'
   testImplementation '{{maven.junit_junit}}'
   {{extra_deps}}

rules_java_gapic/resources/gradle/client_grpcrest.gradle.tmpl

@@ -12,6 +12,8 @@ dependencies {
   testImplementation 'com.google.api:gax-grpc:{{version.gax_grpc}}:testlib'
   implementation 'com.google.api:gax-httpjson:{{version.gax_httpjson}}'
   testImplementation 'com.google.api:gax-httpjson:{{version.gax_httpjson}}:testlib'
+  implementation 'io.grpc:grpc-protobuf:{{version.io_grpc}}'
+  testImplementation 'io.grpc:grpc-stub:{{version.io_grpc}}'
   testImplementation 'io.grpc:grpc-netty-shaded:{{version.io_grpc}}'
   testImplementation '{{maven.junit_junit}}'
   {{extra_deps}}

rules_java_gapic/resources/gradle/proto.gradle.tmpl

@@ -7,6 +7,7 @@ javadoc.options.encoding = 'UTF-8'
 
 dependencies {
   implementation 'com.google.protobuf:protobuf-java:{{version.com_google_protobuf}}'
+  implementation '{{maven.com_google_guava_guava}}'
   implementation '{{maven.com_google_api_api_common}}'
   implementation '{{maven.com_google_api_grpc_proto_google_common_protos}}'
   {{extra_deps}}