[Feature] Implementing self-balanced tree in order to keep all facets

[Rassska]

Hi there!

I just briefly checked the code and realized that in order to keep all facets current diamond version uses a dynamically allocated array and simple mapping for getting O(1) per getFacet() query. What if we could simply store everything in a tree in order to get O(log n) for getFacet() query without having a need to allocate an array and mapping(it looks kind of crutch in a code)?

Thanks!