feat(core.runtime): 支持Content Provider设置multiprocess="true"

当 multiprocess="true" 时，PluginContainerContentProvider 不会在 Application.onCreate 之前创建，而是在真正被调用时才会创建。
当 PluginContainerContentProvider.onCreate 方法被调用时，DelegateProviderHolderPrepareListener.onPrepare 方法已经被调用（在 DynamicPluginLoader.<init> 方法中），导致 PluginContainerContentProvider.hostContentProviderDelegate 没有被赋值。

Author: yanglw

projects/sdk/core/common/src/main/java/com/tencent/shadow/core/runtime/container/PluginContainerContentProvider.java

@@ -38,6 +38,10 @@ public class PluginContainerContentProvider extends ContentProvider {
 
 
     public PluginContainerContentProvider() {
+        ContentProviderDelegateProvider p = ContentProviderDelegateProviderHolder.contentProviderDelegateProvider;
+        if (p != null) {
+            hostContentProviderDelegate = p.getHostContentProviderDelegate();
+        }
         ContentProviderDelegateProviderHolder.setDelegateProviderHolderPrepareListener(new ContentProviderDelegateProviderHolder.DelegateProviderHolderPrepareListener() {
             @Override
             public void onPrepare() {