Bring codebase up to more recent Java standards (#2422)

This includes using the new switch format (though IntelliJ does not yet
understand patterns including default so those aren't used), multiline strings,
replacing some unnecessary type declarations with <>, converting some classes to
records, replacing some Guava predicates with native Java code, and some other
miscellaneous Code Inspection fixes.

networking/src/main/java/google/registry/networking/handler/SslServerInitializer.java

@@ -158,14 +158,16 @@ public class SslServerInitializer<C extends Channel> extends ChannelInitializer<
                             ((RSAPublicKey) clientPublicKey).getModulus().bitLength();
                       }
                       logger.atInfo().log(
-                          "--SSL Information--\n"
-                              + "Client Certificate Hash: %s\n"
-                              + "SSL Protocol: %s\n"
-                              + "Cipher Suite: %s\n"
-                              + "Not Before: %s\n"
-                              + "Not After: %s\n"
-                              + "Client Certificate Type: %s\n"
-                              + "Client Certificate Length: %s\n",
+                          """
+                              --SSL Information--
+                              Client Certificate Hash: %s
+                              SSL Protocol: %s
+                              Cipher Suite: %s
+                              Not Before: %s
+                              Not After: %s
+                              Client Certificate Type: %s
+                              Client Certificate Length: %s
+                              """,
                           getCertificateHash(clientCertificate),
                           sslSession.getProtocol(),
                           sslSession.getCipherSuite(),

networking/src/main/java/google/registry/networking/module/CertificateSupplierModule.java

@@ -131,16 +131,12 @@ public final class CertificateSupplierModule {
       @PemFile Lazy<Supplier<PrivateKey>> pemPrivateKeySupplier,
       @P12File Lazy<Supplier<PrivateKey>> p12PrivateKeySupplier,
       @SelfSigned Lazy<Supplier<PrivateKey>> selfSignedPrivateKeySupplier) {
-    switch (mode) {
-      case PEM_FILE:
-        return pemPrivateKeySupplier.get();
-      case P12_FILE:
-        return p12PrivateKeySupplier.get();
-      case SELF_SIGNED:
-        return selfSignedPrivateKeySupplier.get();
-      default:
-        throw new RuntimeException("Certificate provider mode exhausted.");
-    }
+    return switch (mode) {
+      case PEM_FILE -> pemPrivateKeySupplier.get();
+      case P12_FILE -> p12PrivateKeySupplier.get();
+      case SELF_SIGNED -> selfSignedPrivateKeySupplier.get();
+      default -> throw new RuntimeException("Certificate provider mode exhausted.");
+    };
   }
 
   @Singleton
@@ -150,16 +146,12 @@ public final class CertificateSupplierModule {
       @PemFile Lazy<Supplier<ImmutableList<X509Certificate>>> pemCertificatesSupplier,
       @P12File Lazy<Supplier<ImmutableList<X509Certificate>>> p12CertificatesSupplier,
       @SelfSigned Lazy<Supplier<ImmutableList<X509Certificate>>> selfSignedCertificatesSupplier) {
-    switch (mode) {
-      case PEM_FILE:
-        return pemCertificatesSupplier.get();
-      case P12_FILE:
-        return p12CertificatesSupplier.get();
-      case SELF_SIGNED:
-        return selfSignedCertificatesSupplier.get();
-      default:
-        throw new RuntimeException("Certificate provider mode exhausted.");
-    }
+    return switch (mode) {
+      case PEM_FILE -> pemCertificatesSupplier.get();
+      case P12_FILE -> p12CertificatesSupplier.get();
+      case SELF_SIGNED -> selfSignedCertificatesSupplier.get();
+      default -> throw new RuntimeException("Certificate provider mode exhausted.");
+    };
   }
 
   @Singleton

networking/src/test/java/google/registry/networking/handler/NettyExtension.java

@@ -75,7 +75,7 @@ public final class NettyExtension implements AfterEachCallback {
     checkState(echoHandler == null, "Can't call setUpServer twice");
     echoHandler = new EchoHandler();
     ChannelInitializer<LocalChannel> serverInitializer =
-        new ChannelInitializer<LocalChannel>() {
+        new ChannelInitializer<>() {
           @Override
           protected void initChannel(LocalChannel ch) {
             // Add the given handler
@@ -99,7 +99,7 @@ public final class NettyExtension implements AfterEachCallback {
     checkState(dumpHandler == null, "Can't call setUpClient twice");
     dumpHandler = new DumpHandler();
     ChannelInitializer<LocalChannel> clientInitializer =
-        new ChannelInitializer<LocalChannel>() {
+        new ChannelInitializer<>() {
           @Override
           protected void initChannel(LocalChannel ch) {
             // Add the given handler