chore: Reimplement BTreeMap::clear() to not consume self#198

dragoljub-djuric merged 13 commits intomaindfinity/stable-structures:mainfrom

EXC-1549-reimplement-b-tree-map-clear-to-not-consume-selfdfinity/stable-structures:EXC-1549-reimplement-b-tree-map-clear-to-not-consume-selfCopy head branch name to clipboard