XWIKI-22681: Provide a relative ResourceReferenceEntityReferenceResolver (#3673)

...eference/DefaultReferenceEntityReferenceResolverTest.java

.../reference/RelativeStringEntityReferenceResolverTest.java

...ractRelativeResourceReferenceEntityReferenceResolver.java

...veAttachmentResourceReferenceEntityReferenceResolver.java

...tiveDocumentResourceReferenceEntityReferenceResolver.java

...geAttachmentResourceReferenceEntityReferenceResolver.java

...RelativePageResourceReferenceEntityReferenceResolver.java

...ver/RelativeResourceReferenceEntityReferenceResolver.java

...elativeSpaceResourceReferenceEntityReferenceResolver.java

...endering-xwiki/src/main/resources/META-INF/components.txt

.../DefaultResourceReferenceEntityReferenceResolverTest.java

...RelativeResourceReferenceEntityReferenceResolverTest.java