Add support for query by example

[gabrieldn]

Creating issue as requested on #371

[gabrieldn]

It seems like ReactiveQueryByExampleExecutor does not support Pageable but QueryByExampleExecutor does.

Could it be added or should a new ticket be filed on data commons for this to be supported?

[gcdd1993]

Is there any progress?

[Seelam-Ramesh-Reddy]

Is it possible to use ReactiveQueryByExampleExecutor along with ReactiveCrudRepository ?

[mp911de]

Feel free to submit a pull request to speed things up.

[mp911de]

Fixed via 9336d09.