use Record for object dictionaries

packages/core/src/LLMPredictor.ts

packages/core/src/LanguageModel.ts

packages/core/src/Node.ts

packages/core/src/Prompt.ts

packages/core/src/readers/SimpleDirectoryReader.ts

packages/core/src/storage/FileSystem.ts

packages/core/src/storage/docStore/SimpleDocumentStore.ts

packages/core/src/storage/docStore/types.ts

packages/core/src/storage/kvStore/SimpleKVStore.ts

packages/core/src/storage/kvStore/types.ts

packages/core/src/storage/vectorStore/SimpleVectorStore.ts