[FEATURE]Refactoring of code for better maintainability

[heemin32]

After introducing binary vector format of which has its own code path in across multiple files, the needs of refactoring is required to enhance code maintainability.

Related PR. #1781

Few action items are as follow

1. We have two query vector in KNNQuery class. One for float/byte vectors and another for binary vector. We want to refactor it so that it won't have two vector variables inside single KNNQuery.
2. We have VectorTransfer class. The issue with this class is that the caller should call close() method at the end to make sure the transfer complete properly. We want to avoid such requirement.
3. We have NestedFilteredIdsKNNByteIterator, FilteredIdsKNNByteIterator, NestedFilteredIdsKNNIterator, and FilteredIdsKNNIterator. We want to remove the Byte iterator and reduce code duplication.
4. We introduced thin wrapper class KNNVectorSimilarityFunction to wrap lucene's VectorSimilarityFunction. We might want to see if there is other ways to avoid this thin wrapper.