resolve #329 迁移应用中间件启动服务到`HostedService`中

[HuiJiOnGit]

以下应用启动服务

• Blog.Core.Extensions/Middlewares/SeedDataMiddleware.cs
• Blog.Core.Extensions/Middlewares/QuartzJobMiddleware.cs
• Blog.Core.Extensions/Middlewares/ConsulMiddleware.cs
• Blog.Core.Extensions/ServiceExtensions/EventBusSetup.cs: ConfigureEventBus 迁移到
• Blog.Core.Extensions/HostedService/SeedDataHostedService.cs
• Blog.Core.Extensions/HostedService/QuartzJobHostedService.cs
• Blog.Core.Extensions/HostedService/ConsulHostedService.cs
• Blog.Core.Extensions/HostedService/EventBusHostedService.cs

增加一个扩展方法

• Blog.Core.Extensions/ServiceExtensions/InitializationHostServiceSetup.cs