Make configurations more easier

[catcherwong]

Description

The configurations of EasyCaching is a little complex and dispersive. We should combine them with only one entry.

Steps to Reproduce

None

Related code

 public void ConfigureServices(IServiceCollection services)
 {
    services.AddEasyCaching(option =>
    {
        option.UseInMemory(xxx);
        option.UseRedis(xxx).WithMessagePack();
        //...
    });
}

//SQLite and Memcached
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    app.UseEasyCaching();
}

Specifications

None

[catcherwong]

Release Tag v0.4.5