code optimization

[yilianhuaixiao]

Now that the following code：

var serviceProviderFactory = services.GetSingletonInstanceOrNull<IServiceProviderFactory<TContainerBuilder>>();
if (serviceProviderFactory == null)
		    {
			    throw new AbpException($"Could not find {typeof(IServiceProviderFactory<TContainerBuilder>).FullName} in {services}.");
		    }

requires 'IServiceProviderFactory' Service Type,
For intuition and efficiency, my code may be better. And strickly saying, they are not of equal value. If registered service type 'XxxServiceProviderFactory', the former code may throw AbpException($"Could not find {typeof(IServiceProviderFactory<TContainerBuilder>).FullName} in {services}."), my code won't.
It will just return 'services.BuildServiceProvider()'.

[hikalkan]

I am not sure if this produces the same result (I didn't spend time much :). I will consider this later since it has not an important enhancement.

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