first support for meta-annotations for the integration tests

Issue: SPR-7827

prior this commit, there was no support for meta-annotations in the Spring Intergation tests, now the @ContextConfiguration annotation is searched also in meta-annotations.

Eg: you can write:
---------------
@ContextConfiguration([...]) // config for HSQLDB environment
public @interface InRamEnvironment
---------------
@ContextConfiguration([...]) // config for common-core part
public @interface CommonCoreIntegrationTest
---------------
@CommonCoreIntegrationTest
@InRamEnvironment
public class OneBatchTest {

[...] // actual test methods
First documentation for meta-annotations support on spring-test