Core: Add 'google' auth type to auth manager

Author: ebyhr

core/src/main/java/org/apache/iceberg/rest/auth/AuthManagers.java

@@ -95,6 +95,9 @@ public static AuthManager loadAuthManager(String name, Map<String, String> prope
       case AuthProperties.AUTH_TYPE_SIGV4:
         impl = AuthProperties.AUTH_MANAGER_IMPL_SIGV4;
         break;
+      case AuthProperties.AUTH_TYPE_GOOGLE:
+        impl = AuthProperties.AUTH_MANAGER_IMPL_GOOGLE;
+        break;
       case AuthProperties.AUTH_TYPE_OAUTH2:
         impl = AuthProperties.AUTH_MANAGER_IMPL_OAUTH2;
         break;

core/src/main/java/org/apache/iceberg/rest/auth/AuthProperties.java

@@ -28,6 +28,7 @@ private AuthProperties() {}
   public static final String AUTH_TYPE_BASIC = "basic";
   public static final String AUTH_TYPE_OAUTH2 = "oauth2";
   public static final String AUTH_TYPE_SIGV4 = "sigv4";
+  public static final String AUTH_TYPE_GOOGLE = "google";
 
   public static final String AUTH_MANAGER_IMPL_NONE =
       "org.apache.iceberg.rest.auth.NoopAuthManager";
@@ -37,6 +38,8 @@ private AuthProperties() {}
       "org.apache.iceberg.rest.auth.OAuth2Manager";
   public static final String AUTH_MANAGER_IMPL_SIGV4 =
       "org.apache.iceberg.aws.RESTSigV4AuthManager";
+  public static final String AUTH_MANAGER_IMPL_GOOGLE =
+      "org.apache.iceberg.gcp.auth.GoogleAuthManager";
 
   public static final String BASIC_USERNAME = "rest.auth.basic.username";
   public static final String BASIC_PASSWORD = "rest.auth.basic.password";