feat: migrate `@llamaindex/cloud` package (#984)

.github/workflows/test.yml

.gitignore

packages/cloud/README.md

packages/cloud/openapi-ts.config.ts

packages/cloud/openapi.json

packages/cloud/package.json

packages/cloud/src/api.ts

packages/cloud/tsconfig.json

packages/llamaindex/package.json

packages/llamaindex/src/cloud/LlamaCloudIndex.ts

packages/llamaindex/src/cloud/LlamaCloudRetriever.ts

packages/llamaindex/src/cloud/config.ts

packages/llamaindex/src/cloud/constants.ts

packages/llamaindex/src/cloud/index.ts

packages/llamaindex/src/cloud/utils.ts

packages/llamaindex/src/index.edge.ts

packages/llamaindex/src/index.ts

pnpm-lock.yaml

tsconfig.json