refactor: support configuration settings and configmap name (#2299)

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#### What type of PR is this?
/kind improvement
/area core
/milestone 2.0
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#### What this PR does / why we need it:
主题支持配置 settingName 和 configMapName

#### Which issue(s) this PR fixes:

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Fixes #2298

#### Special notes for your reviewer:
/cc @halo-dev/sig-halo 
#### Does this PR introduce a user-facing change?

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```release-note
None
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src/main/java/run/halo/app/core/extension/Theme.java

@@ -4,6 +4,8 @@ import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.lang.NonNull;
 import run.halo.app.extension.AbstractExtension;
 import run.halo.app.extension.GVK;
 
@@ -24,6 +26,7 @@ public class Theme extends AbstractExtension {
     @Data
     @ToString
     public static class ThemeSpec {
+        private static final String WILDCARD = "*";
 
         @Schema(required = true, minLength = 1)
         private String displayName;
@@ -39,9 +42,29 @@ public class Theme extends AbstractExtension {
 
         private String repo;
 
-        private String version = "*";
+        private String version;
 
-        private String require = "*";
+        private String require;
+
+        private String settingName;
+
+        private String configMapName;
+
+        @NonNull
+        public String getVersion() {
+            if (StringUtils.isBlank(this.version)) {
+                return WILDCARD;
+            }
+            return version;
+        }
+
+        @NonNull
+        public String getRequire() {
+            if (StringUtils.isBlank(this.require)) {
+                return WILDCARD;
+            }
+            return require;
+        }
     }
 
     @Data

src/test/java/run/halo/app/core/extension/ThemeTest.java

@@ -0,0 +1,82 @@
+package run.halo.app.core.extension;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.json.JSONException;
+import org.junit.jupiter.api.Test;
+import org.skyscreamer.jsonassert.JSONAssert;
+import run.halo.app.extension.Metadata;
+import run.halo.app.infra.utils.JsonUtils;
+
+/**
+ * Tests for {@link Theme}.
+ *
+ * @author guqing
+ * @since 2.0.0
+ */
+class ThemeTest {
+
+    @Test
+    void constructor() throws JSONException {
+        Theme theme = new Theme();
+        Metadata metadata = new Metadata();
+        metadata.setName("test-theme");
+        theme.setMetadata(metadata);
+
+
+        Theme.ThemeSpec themeSpec = new Theme.ThemeSpec();
+        theme.setSpec(themeSpec);
+        themeSpec.setDisplayName("test-theme");
+
+        Theme.Author author = new Theme.Author();
+        author.setName("test-author");
+        author.setWebsite("https://test.com");
+        themeSpec.setAuthor(author);
+
+        themeSpec.setRepo("https://test.com");
+        themeSpec.setLogo("https://test.com");
+        themeSpec.setWebsite("https://test.com");
+        themeSpec.setDescription("test-description");
+        themeSpec.setConfigMapName("test-config-map");
+        themeSpec.setSettingName("test-setting");
+
+        themeSpec.setVersion(null);
+        themeSpec.setRequire(null);
+        JSONAssert.assertEquals("""
+                {
+                    "spec": {
+                        "displayName": "test-theme",
+                        "author": {
+                            "name": "test-author",
+                            "website": "https://test.com"
+                        },
+                        "description": "test-description",
+                        "logo": "https://test.com",
+                        "website": "https://test.com",
+                        "repo": "https://test.com",
+                        "version": "*",
+                        "require": "*",
+                        "settingName": "test-setting",
+                        "configMapName": "test-config-map"
+                    },
+                    "apiVersion": "theme.halo.run/v1alpha1",
+                    "kind": "Theme",
+                    "metadata": {
+                        "name": "test-theme",
+                        "labels": null,
+                        "annotations": null,
+                        "version": null,
+                        "creationTimestamp": null,
+                        "deletionTimestamp": null
+                    }
+                }
+                """,
+            JsonUtils.objectToJson(theme),
+            true);
+
+        themeSpec.setVersion("1.0.0");
+        themeSpec.setRequire("2.0.0");
+        assertThat(themeSpec.getVersion()).isEqualTo("1.0.0");
+        assertThat(themeSpec.getRequire()).isEqualTo("2.0.0");
+    }
+}