Optimize Create and add tests#10

ogxd merged 3 commits intoequativ:mainequativ/Equativ.RoaringBitmaps:mainfrom

mitikov:codex/refactor-create-to-sort-and-group-in-one-passmitikov/Equativ.RoaringBitmaps:codex/refactor-create-to-sort-and-group-in-one-passCopy head branch name to clipboard