Spring [SPR-9719] Improve TypeUtils.isAssignable recognize TypeVariable types

I add th code in TypeUtils and TypeUtilsTest.

In isAssignable method, the case when parameter is TypeVariable is added.

This is reported in Jira SPR-9719: TypeUtils.isAssignable does not recognize TypeVariable types

After checking if lhsType is instanceof Class<?>, rhsType will be check TypeVariable.

else if(rhsType instanceof TypeVariable) { Type[] types = ((TypeVariable<?>)rhsType).getBounds();

for(int i=0; i<types.length; i++) {
   if(isAssignable(lhsClass, types[i])) return true;
}

}

Please consider this.

I hope that I can contribute. Thanks.

Comment From: philwebb

Hi @youngjee,

Thanks for the contribution. Have you signed the contributors license agreement yet? It is pretty straight forward and shouldn't take long.

https://github.com/SpringSource/spring-framework/blob/master/CONTRIBUTING.md

Comment From: youngjee

Thanks.

I have signed and agree to the terms of the SpringSource Individual Contributor License Agreement.

Comment From: vyncentk

Hi @youngjee , would you mind get a look into clonflicts and codacy ? Thanks

Comment From: pivotal-issuemaster

@youngjee Please sign the Contributor License Agreement!

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