Modulo retrieve

Add method to load given type of annotations linked to objects.
see https://trac.openmicroscopy.org.uk/ome/ticket/10043

In this PR:
 * Add a new method.
 * Add support for modulo NS.
 * Add tests.

To test the PR, run 

```
./build.py -f components/tools/OmeroJava/build.xml test -DTEST=integration/MetadataServiceTest
```
and  (for missing XmlAnnotation support)

```
./build.py -f components/tools/OmeroJava/build.xml test -DTEST=integration/UpdateServiceTest
```