Spring Optimize getDependencyType implementation of DependencyDescriptor by using ResolvableType

This pr optimizes getDependencyType implementation of DependencyDescriptor by using ResolvableType instead of native type operations. Please help review the code by Files changed. Looking forward to your reply.

Comment From: chenqimiao

I think using ResolvableType to achieve the acquisition of nested raw class to optimize existing duplicate and long code. Can someone help confirm the review?

Comment From: snicoll

Good catch @chenqimiao