refactor(web): begin implementation of SearchCluster for merging paths reaching the same intermediate tokenization state 🚂#14949

jahorton wants to merge 7 commits intorefactor/web/simplify-input-segmentskeymanapp/keyman:refactor/web/simplify-input-segmentsfrom

refactor/web/complex-search-space-reusekeymanapp/keyman:refactor/web/complex-search-space-reuseCopy head branch name to clipboard