Add a Secret Manager client for Nomulus (#872)

* Add a Secret Manager client for Nomulus

dependencies.gradle

@@ -18,6 +18,8 @@ ext {
     dependencyList = [
       'args4j:args4j:2.0.26',
       'com.beust:jcommander:1.60',
+      'com.google.api:gax:1.60.0',
+      'com.google.api.grpc:proto-google-cloud-secretmanager-v1:1.2.3',
       'com.google.api-client:google-api-client-java6:1.27.0',
       'com.google.api-client:google-api-client:1.30.8',
       'com.google.api-client:google-api-client-appengine:1.30.8',
@@ -48,6 +50,7 @@ ext {
       'com.google.cloud.sql:jdbc-socket-factory-core:1.0.16',
       'com.google.cloud.sql:postgres-socket-factory:1.0.16',
       'com.google.cloud:google-cloud-core:1.59.0',
+      'com.google.cloud:google-cloud-secretmanager:1.2.3',
       'com.google.cloud:google-cloud-storage:1.59.0',
       'com.google.code.findbugs:jsr305:3.0.2',
       'com.google.code.gson:gson:2.8.5',
@@ -56,8 +59,8 @@ ext {
       'com.google.errorprone:error_prone_annotations:2.3.4',
       'com.google.flogger:flogger-system-backend:0.1',
       'com.google.flogger:flogger:0.1',
-      'com.google.guava:guava-testlib:29.0-jre',
-      'com.google.guava:guava:29.0-jre',
+      'com.google.guava:guava-testlib:30.0-jre',
+      'com.google.guava:guava:30.0-jre',
       'com.google.gwt:gwt-user:2.8.2',
       'com.google.http-client:google-http-client-appengine:1.34.1',
       'com.google.http-client:google-http-client-jackson2:1.34.1',
@@ -71,6 +74,7 @@ ext {
       'com.google.oauth-client:google-oauth-client-java6:1.27.0',
       'com.google.oauth-client:google-oauth-client-jetty:1.28.0',
       'com.google.oauth-client:google-oauth-client-servlet:1.30.5',
+      'com.google.protobuf:protobuf-java:3.13.0',
       'com.google.re2j:re2j:1.1',
       'com.google.template:soy:2018-03-14',
       'com.google.truth.extensions:truth-java8-extension:1.0',