Add type name to AbstractRepositoryMetadata verification exception message

[kgignatyev]

Adding type info in the error message for easier troubleshooting. Got the error

java.lang.IllegalArgumentException: Given type must be an interface
	at org.springframework.util.Assert.isTrue(Assert.java:111)
	at org.springframework.data.repository.core.support.AbstractRepositoryMetadata.<init>(AbstractRepositoryMetadata.java:59)
	at org.springframework.data.repository.core.support.DefaultRepositoryMetadata.<init>(DefaultRepositoryMetadata.java:51)
	at org.springframework.data.repository.core.support.AbstractRepositoryMetadata.getMetadata(AbstractRepositoryMetadata.java:77)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.AbstractList$RandomAccessSpliterator.tryAdvance(AbstractList.java:708)

for the declaration (Kotlin)

@Service
@Transactional
class LitterBizSvc(val litterCollectionRepo: LitterCollectionRepo,
    val eventPub:ApplicationEventPublisher): CrudRepository<LitterCollection, String> by litterCollectionRepo {

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[mp911de]

Thank you for your contribution. That's merged, polished, and backported now.