feat: support custom `@xenova/transformers` (#1232)

.changeset/beige-coats-enjoy.md

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

packages/env/package.json

packages/env/src/index.browser.ts

packages/env/src/index.edge-light.ts

packages/env/src/index.ts

packages/env/src/index.workerd.ts

packages/env/src/multi-model/index.browser.ts

packages/env/src/multi-model/index.non-nodejs.ts

packages/env/src/multi-model/index.ts

packages/env/src/multi-model/shared.ts

...ndex/e2e/examples/nextjs-edge-runtime/src/app/globals.css

...maindex/e2e/examples/nextjs-edge-runtime/src/utils/llm.ts

packages/llamaindex/e2e/node/embedding/clip.e2e.ts

packages/llamaindex/package.json

packages/llamaindex/src/Settings.ts

packages/llamaindex/src/embeddings/ClipEmbedding.ts

packages/llamaindex/src/embeddings/HuggingFaceEmbedding.ts

packages/llamaindex/src/embeddings/index.ts

packages/llamaindex/src/index.ts