New binding for returning List[List] instead of numpy array

[Scikud]

Often it's useful to return lists instead of numpy arrays. This is especially useful when using filtering if k > num of items returned after filtering. There may also be instances where you'd like to return noncontigous 2d arrays. This PR adds a new binding that will return a List of Lists instead of a numpy array.

This pr should fix contigious 2D array.

cc @yurymalkov

[dyashuni]

@Scikud Thank you for the PR!
Could you please modify the existing function knnQuery_return_numpy instead of creating a new one?
You can take a look at the getData function as an example. It has a return_type parameter that can be set to either numpy or list. Then we will need to rename the knnQuery_return_numpy function to something like knnQuery.