Remove unused code related to SingletonConfig (#1192)

SingletonConfig was removed when upgrading to v3.0.0.

Author: nakamura-to

doma-core/src/main/java/org/seasar/doma/jdbc/id/IdGenerationConfig.java

@@ -24,6 +24,7 @@ public IdGenerationConfig(Config config, EntityType<?> entityType) {
     this(config, entityType, new UnavailableIdProvider());
   }
 
+  @Deprecated
   public IdGenerationConfig(Config config, EntityType<?> entityType, IdProvider idProvider) {
     assertNotNull(config, entityType, idProvider);
     this.config = config;

doma-processor/src/main/java/org/seasar/doma/internal/apt/annot/SingletonConfigAnnot.java

@@ -77,8 +77,6 @@
 
 public class DaoMetaFactory implements TypeElementMetaFactory<DaoMeta> {
 
-  private static final String SINGLETON_CONFIG_FIELD_NAME = "INSTANCE";
-
   private final Context ctx;
 
   private final List<BiFunction<TypeElement, ExecutableElement, QueryMetaFactory>> providers =

doma-processor/src/main/java/org/seasar/doma/internal/apt/meta/dao/DaoMetaFactory.java

@@ -123,7 +123,6 @@ public Stream<TestTemplateInvocationContext> provideTestTemplateInvocationContex
           invocationContext(SQLXMLFactoryDao.class),
           invocationContext(Issue82Dao.class),
           invocationContext(ResultStreamDao.class),
-          invocationContext(PlainSingletonConfigDao.class),
           invocationContext(SqlProcessorDao.class),
           invocationContext(OnlyDefaultMethodsExtendsDao.class),
           invocationContext(