feat: init `@llamaindex/core` (#938)

.github/workflows/test.yml

package.json

packages/community/jsr.json

packages/core/package.json

packages/core/src/decorator/index.ts

packages/core/src/global/index.ts

packages/core/src/global/settings.ts

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

packages/core/src/index.ts

packages/core/src/schema/index.ts

packages/core/src/schema/node.ts

packages/core/src/schema/zod.ts

packages/core/tests/decorator.test.ts

packages/core/tests/package.json

packages/core/tests/schema-node.test.ts

packages/core/tests/tsconfig.json

packages/core/tsconfig.json

packages/env/jsr.json

packages/experimental/jsr.json

packages/llamaindex/jsr.json