RadiusNeighborsClassifier Support

[napetrov]

Discussed in #1583

^{Originally posted by SebNav November 21, 2023}
Hello, I like this project and regularly use several of the algorithms currently supported, such as SVC, KNN classifier, and DBSCAN. Nowadays, I am looking for some kind of optimized and fast implementation of RadiusNeighborsClassifier. It would be good to have that implementation in this library.
Thank you very much for your work.

[ricor07]

Hello, I'd like to join the project by working on this issue.

[napetrov]

@ricor07 , sure. Thanks for volunteering. be free to ask any info that would be useful. This one would probably require some overview on how this can be implemented and if this is something that can be done purely in sklearnex with existing oneDAL primitives or new implementation should be done in oneDAL first