Simplify halo plugin manager (halo-dev#5251)

#### What type of PR is this?

/kind improvement
/area core
/area plugin
/milestone 2.12.x

#### What this PR does / why we need it:

This PR mainly simplifies halo plugin manager. Before this,
- we have too many repeat code from super class, which is uncessary
- we maintain plugin application context in ExtensionComponentsFinder, which is uncessary and is hard to manage
- we fire halo plugin event in halo plugin manager, which is complicated and leads to too many repeat code

This PR does:
- refactor halo plugin manager
- wrap base plugin with spring plugin which contains application context
- remove ExtensionComponentsFinder
- bridge halo plugin event and spring plugin event
- wait extensions fully deleted when stopping

Meanwhile, this PR will supersede PR <halo-dev#5236>.

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

Fixes halo-dev#5226

#### Special notes for your reviewer:

Test installing, enabing, disabling, upgrading, reloading and deleting plugins.

#### Does this PR introduce a user-facing change?

```release-note
None
```

application/src/main/java/run/halo/app/core/extension/reconciler/PluginReconciler.java

@@ -262,8 +262,8 @@ private void resolveStaticResources(Plugin plugin) {
         var p = pluginManager.getPlugin(pluginName);
         var classLoader = p.getPluginClassLoader();
         var resLoader = new DefaultResourceLoader(classLoader);
-        var entryRes = resLoader.getResource("classpath:/console/main.js");
-        var cssRes = resLoader.getResource("classpath:/console/style.css");
+        var entryRes = resLoader.getResource("classpath:console/main.js");
+        var cssRes = resLoader.getResource("classpath:console/style.css");
         if (entryRes.exists()) {
             var entry = UriComponentsBuilder.newInstance()
                 .pathSegment("plugins", pluginName, "assets", "console", "main.js")

application/src/main/java/run/halo/app/core/extension/reconciler/ReverseProxyReconciler.java

@@ -55,12 +55,12 @@ public Controller setupWith(ControllerBuilder builder) {
 
     private void registerReverseProxy(ReverseProxy reverseProxy) {
         String pluginId = getPluginId(reverseProxy);
-        routerFunctionRegistry.register(pluginId, reverseProxy).block();
+        routerFunctionRegistry.register(pluginId, reverseProxy);
     }
 
     private void cleanUpResources(ReverseProxy reverseProxy) {
         String pluginId = getPluginId(reverseProxy);
-        routerFunctionRegistry.remove(pluginId, reverseProxy.getMetadata().getName()).block();
+        routerFunctionRegistry.remove(pluginId, reverseProxy.getMetadata().getName());
     }
 
     private void addFinalizerIfNecessary(ReverseProxy oldReverseProxy) {

application/src/main/java/run/halo/app/infra/DefaultSystemVersionSupplier.java

@@ -1,10 +1,9 @@
 package run.halo.app.infra;
 
 import com.github.zafarkhaja.semver.Version;
-import org.apache.commons.lang3.StringUtils;
-import org.springframework.beans.factory.annotation.Autowired;
+import java.util.Objects;
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.info.BuildProperties;
-import org.springframework.lang.Nullable;
 import org.springframework.stereotype.Component;
 
 /**
@@ -17,21 +16,19 @@
 public class DefaultSystemVersionSupplier implements SystemVersionSupplier {
     private static final String DEFAULT_VERSION = "0.0.0";
 
-    @Nullable
-    private BuildProperties buildProperties;
+    private final ObjectProvider<BuildProperties> buildProperties;
 
-    @Autowired(required = false)
-    public void setBuildProperties(@Nullable BuildProperties buildProperties) {
+    public DefaultSystemVersionSupplier(ObjectProvider<BuildProperties> buildProperties) {
         this.buildProperties = buildProperties;
     }
 
     @Override
     public Version get() {
-        if (buildProperties == null) {
+        var properties = buildProperties.getIfUnique();
+        if (properties == null) {
             return Version.valueOf(DEFAULT_VERSION);
         }
-        String projectVersion =
-            StringUtils.defaultString(buildProperties.getVersion(), DEFAULT_VERSION);
+        var projectVersion = Objects.toString(properties.getVersion(), DEFAULT_VERSION);
         return Version.valueOf(projectVersion);
     }
 }