feat: add verison parameter for component resources (#22)

为搜索组件资源添加版本号，防止升级之后无法及时更新缓存。

/kind improvement

```release-note
为搜索组件资源添加版本号，防止升级之后无法及时更新缓存。
```

build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'java'
+    id "io.freefair.lombok" version "8.0.1"
     id "com.github.node-gradle.node" version "3.3.0"
     id "run.halo.plugin.devtools" version "0.0.4"
 }

src/main/java/run/halo/search/widget/SearchWidgetHeadProcessor.java

@@ -1,18 +1,25 @@
 package run.halo.search.widget;
 
+import lombok.RequiredArgsConstructor;
+import org.pf4j.PluginWrapper;
 import org.springframework.stereotype.Component;
+import org.springframework.util.PropertyPlaceholderHelper;
 import org.thymeleaf.context.ITemplateContext;
 import org.thymeleaf.model.IModel;
 import org.thymeleaf.model.IModelFactory;
 import org.thymeleaf.processor.element.IElementModelStructureHandler;
 import reactor.core.publisher.Mono;
 import run.halo.app.theme.dialect.TemplateHeadProcessor;
 
+import java.util.Properties;
+
 @Component
+@RequiredArgsConstructor
 public class SearchWidgetHeadProcessor implements TemplateHeadProcessor {
 
-    public SearchWidgetHeadProcessor() {
-    }
+    static final PropertyPlaceholderHelper PROPERTY_PLACEHOLDER_HELPER = new PropertyPlaceholderHelper("${", "}");
+
+    private final PluginWrapper pluginWrapper;
 
     @Override
     public Mono<Void> process(ITemplateContext context, IModel model,
@@ -23,11 +30,15 @@ public Mono<Void> process(ITemplateContext context, IModel model,
     }
 
     private String searchWidgetScript() {
-        return """
+
+        final Properties properties = new Properties();
+        properties.setProperty("version", pluginWrapper.getDescriptor().getVersion());
+
+        return PROPERTY_PLACEHOLDER_HELPER.replacePlaceholders("""
                 <!-- PluginSearchWidget start -->
-                <script src="/plugins/PluginSearchWidget/assets/static/search-widget.iife.js" async></script>
-                <link rel="stylesheet" href="/plugins/PluginSearchWidget/assets/static/style.css" />
+                <script src="/plugins/PluginSearchWidget/assets/static/search-widget.iife.js?version=${version}" async></script>
+                <link rel="stylesheet" href="/plugins/PluginSearchWidget/assets/static/style.css?version=${version}" />
                 <!-- PluginSearchWidget end -->
-                """;
+                """, properties);
     }
 }