feat: node parser refactor (#1065)

.changeset/young-schools-kneel.md

examples/longText.ts

examples/split.ts

packages/core/package.json

packages/core/src/embeddings/base.ts

packages/core/src/global/settings.ts

packages/core/src/global/settings/callback-manager.ts

packages/core/src/global/settings/chunk-size.ts

packages/core/src/global/settings/tokenizer.ts

packages/core/src/node-parser/base.ts

packages/core/src/node-parser/index.ts

packages/core/src/node-parser/markdown.ts

packages/core/src/node-parser/sentence-splitter.ts

packages/core/src/node-parser/sentence-tokenizer-parser.d.ts

packages/core/src/node-parser/sentence-tokenizer-parser.js

packages/core/src/node-parser/sentence-window.ts

packages/core/src/node-parser/type.ts

packages/core/src/node-parser/utils.ts

packages/core/src/schema/node.ts

packages/core/src/schema/type.ts