refactor: move groq as llm package (#1209)

.changeset/nine-rules-hug.md

.github/workflows/test.yml

examples/groq.ts

packages/llamaindex/package.json

packages/llamaindex/src/llm/groq.ts

packages/llamaindex/src/llm/index.ts

packages/llamaindex/src/next.ts

packages/llm/groq/CHANGELOG.md

packages/llm/groq/package.json

packages/llm/groq/src/index.ts

packages/llm/groq/src/llm.ts

packages/llm/groq/tsconfig.json

pnpm-lock.yaml

tsconfig.json