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

[yanglw]

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 被调用时，DelegateProviderHolderPrepareListener.onPrepare() 方法已经调用（在 DynamicPluginLoader. 方法中），导致 PluginContainerContentProvider.hostContentProviderDelegate 没有被赋值。

[tencent-adm]

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[shifujun]

提交日志检查出错了，原因是标题过长。这个提交日志建议改为：

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 被调用时，DelegateProviderHolderPrepareListener.onPrepare() 方法已经调用（在 DynamicPluginLoader. 方法中），导致 PluginContainerContentProvider.hostContentProviderDelegate 没有被赋值。