Add XML config support ResourceResolver & ResourceTransformer

This change adds support for configuring ResourceResolvers and
ResourceTransformers with ResourceHttpRequestHandlers.

This is an example configuration:

    <mvc:resources mapping="/resources/**" location="/">
      <mvc:resolvers>
        <bean class="org.springframework.web.servlet.resource.PathResourceResolver"/>
        <ref bean="myResourceResolver"/>
      </mvc:resolvers>
      <mvc:transformers>
        <bean class="org.springframework.web.servlet.resource.CssLinkResourceTransformer" />
      </mvc:transformers>
    </mvc:resources>

    <bean id="myResourceResolver" class="org.example.resource.MyResourceResolver"/>

Issue: SPR-10951