[feature] Warning for overriding bean names in same xml files

Add support for diagnostics for xml file configurations.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- bean definitions here -->
    <bean class="com.example.demo.NonBootBean"/>
    <bean class="com.example.demo.NonBootBean">
        <property name="age" ref="nonBootBean"/>
    </bean>
    <bean class="org.apache.commons.dbcp2.BasicDataSource" name="datasource">
    	<property name="driver"></property>
    </bean>
    
    <bean class="org.apache.commons.dbcp2.BasicDataSource" name="datasource">
    	<property name="driver"></property>
    </bean>
</beans>

it would be nice to provide a warning about the overriding bean in this case, think if this was a large file a accidental overriding can be avoided.

The issue names no files, tests, or entry points. Start by locating the Spring XML configuration diagnostics entry point and its tests, then reproduce the duplicate bean-name example and define the warning's expected scope; done means duplicate bean names in one XML file produce a warning without affecting valid configurations.