Add prefix to error code (#2444)

Author: brfrn169

core/src/main/java/com/scalar/db/common/error/CoreError.java

@@ -979,7 +979,7 @@ public enum CoreError implements ScalarDbError {
       ""),
   ;
 
-  private static final String COMPONENT_NAME = "CORE";
+  private static final String COMPONENT_NAME = "DB-CORE";
 
   private final Category category;
   private final String id;

core/src/test/java/com/scalar/db/common/error/CoreErrorTest.java

@@ -23,7 +23,7 @@ public void buildCode_ShouldBuildCorrectCode() {
     String code = error.buildCode();
 
     // Assert
-    Assertions.assertThat(code).isEqualTo("CORE-10000");
+    Assertions.assertThat(code).isEqualTo("DB-CORE-10000");
   }
 
   @Test
@@ -43,6 +43,6 @@ public void buildMessage_ShouldBuildCorrectMessage() {
 
     // Assert
     Assertions.assertThat(message)
-        .isEqualTo("CORE-10000: Only a single-column index is supported. Operation: " + put);
+        .isEqualTo("DB-CORE-10000: Only a single-column index is supported. Operation: " + put);
   }
 }