Support selecting and counting in parallel in SimpleCouchbaseRepository#findAll(Pageable pageable)

We use something like this in our custom base repository:

final Mono<Long> totalCount = getReactiveCouchbaseOperations().findByQuery(getEntityInformation().getJavaType())
                    .withConsistency(buildQueryScanConsistency())
                    .matching(new Query().with(pageable))
                    .count();

final Mono<List<T>> pageContents = getReactiveCouchbaseOperations().findByQuery(getEntityInformation().getJavaType())
                    .withConsistency(buildQueryScanConsistency())
                    .matching(new Query().with(pageable))
                    .all()
                    .collectList();

// zip the two queries together to return the requested Page
return Mono.zip(pageContents, totalCount, (list, count) -> new PageImpl<T>(list, pageable, count))
                    .block();

Start at SimpleCouchbaseRepository#findAll(Pageable pageable) and compare its current paging behavior with the two reactive queries shown in the issue. Check how the repository creates the page contents and total count, then verify that both results are combined into the requested Page without blocking each operation separately.