feat: add one-cap word-list generator

lib_vector_search/include/bucket_finder.h

@@ -10,8 +10,6 @@ private:
   std::map<const char, WordRefList> groups_;
 
 public:
-  Bucket() = default;
-
   void insert(const WordList &word_list, size_t first_index, size_t last_index);
 
   std::forward_list<const std::string *>

lib_vector_search/include/word_list.h

@@ -11,6 +11,7 @@ public:
   WordList &multiply(size_t factor);
   WordList &shuffle();
 
+  static WordList oneCap();
   static WordList fourCaps();
   static WordList fromFile(const std::filesystem::path &path);