Migrate @Provides methods to @Binds methods where possible.

@Binds is a much more efficient way to delegate one binding to another in that:
  * The @Binds method does not need to be invoked
  * It does not generate an additional Provider implementation
  * An additional Provider does does not need to be instantiated
Future changes to Dagger's component processor will add even further benefits.

More information: []

ATTENTION REVIEWERS: This migration is being done with global approval.  Per-project approval is not required.

Tested:
    TAP train for global presubmit queue
    []
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=125980758

java/google/registry/tools/RegistryToolModule.java

@@ -14,6 +14,7 @@
 
 package google.registry.tools;
 
+import dagger.Binds;
 import dagger.Module;
 import dagger.Provides;
 
@@ -24,17 +25,15 @@ import java.util.Random;
 
 /** Dagger module for Registry Tool. */
 @Module
-final class RegistryToolModule {
+abstract class RegistryToolModule {
 
   @Provides
   static RegistryToolEnvironment provideRegistryToolEnvironment() {
     return RegistryToolEnvironment.get();
   }
 
-  @Provides
-  static PasswordGenerator providePasswordGenerator(RandomPasswordGenerator passwordGenerator) {
-    return passwordGenerator;
-  }
+  @Binds
+  abstract PasswordGenerator providePasswordGenerator(RandomPasswordGenerator passwordGenerator);
 
   @Provides
   static Random provideRandom() {