feat: refactor verb storage to use HNSWVerb for improved performance

- Updated MemoryStorage and BaseStorage to handle HNSWVerb instead of GraphVerb.
- Introduced methods to save and retrieve verb metadata separately.
- Enhanced getVerb and getAllVerbs methods to convert HNSWVerb to GraphVerb with metadata.
- Improved data handling and filtering in various storage methods.

src/index.ts

@@ -250,6 +250,7 @@ import type {
   EmbeddingFunction,
   EmbeddingModel,
   HNSWNoun,
+  HNSWVerb,
   HNSWConfig,
   StorageAdapter
 } from './coreTypes.js'
@@ -271,6 +272,7 @@ export type {
   EmbeddingFunction,
   EmbeddingModel,
   HNSWNoun,
+  HNSWVerb,
   HNSWConfig,
   HNSWOptimizedConfig,
   StorageAdapter