Prefer re2 over java.util.regex

Java's stock regex implementation doesn't guarantee linear time
complexity which makes it a security liability.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=121159875

java/google/registry/util/BUILD

@@ -28,6 +28,7 @@ java_library(
         "//third_party/java/jsr305_annotations",
         "//third_party/java/jsr330_inject",
         "//third_party/java/objectify:objectify-v4_1",
+        "//third_party/java/re2j",
         "//third_party/java/servlet/servlet_api",
         "//java/google/registry/config",
     ],

java/google/registry/util/SqlTemplate.java

@@ -22,11 +22,11 @@ import static google.registry.util.PreconditionsUtils.checkArgumentNotNull;
 import com.google.common.base.CharMatcher;
 import com.google.common.base.Joiner;
 import com.google.common.collect.ImmutableMap;
+import com.google.re2j.Matcher;
+import com.google.re2j.Pattern;
 
 import java.util.HashSet;
 import java.util.Set;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
 import javax.annotation.concurrent.Immutable;