Bug if the @Id field is private but has a public getter

[pfichtner]

When having a private @id annotated field that has an public getter spring-data-mock fails with

com.mmnaseri.utils.spring.data.error.DataOperationExecutionException: Method call resulted in internal error: public java.lang.Object com.mmnaseri.utils.spring.data.repository.CrudRepositorySupport.save(java.lang.Object)
        at com.mmnaseri.utils.spring.data.domain.impl.MethodInvocationDataStoreOperation.execute(MethodInvocationDataStoreOperation.java:43)
        at com.mmnaseri.utils.spring.data.proxy.impl.DataOperationInvocationHandler.invoke(DataOperationInvocationHandler.java:92)
        at com.sun.proxy.$Proxy4.save(Unknown Source)
        at com.mmnaseri.utils.spring.data.dsl.factory.RepositoryFactoryBuilderTest.privateIdFieldIssue(RepositoryFactoryBuilderTest.java:485)
Caused by: java.lang.IllegalStateException: Failed to set property value through the field private java.lang.Long com.mmnaseri.utils.spring.data.dsl.factory.RepositoryFactoryBuilderTest$EntityWithAnnotatedIdFieldAndGetter.id
        at com.mmnaseri.utils.spring.data.tools.PropertyUtils.setPropertyValue(PropertyUtils.java:162)
        at com.mmnaseri.utils.spring.data.repository.CrudRepositorySupport.save(CrudRepositorySupport.java:51)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.mmnaseri.utils.spring.data.domain.impl.MethodInvocationDataStoreOperation.execute(MethodInvocationDataStoreOperation.java:38)
        ... 40 more

This is because

spring-data-mock/spring-data-mock/src/main/java/com/mmnaseri/utils/spring/data/tools/PropertyUtils.java

Line 155 in e854772

if (Modifier.isFinal(field.getModifiers())) {

only checks if the field is not final when changing it to be accessible. The code also should check if the field is private.

Testcase showing the problem added, please move the code as desired.