Add license files to each of the subpackages (#17856)

llama-index-cli/LICENSE

llama-index-experimental/LICENSE

llama-index-finetuning/LICENSE

llama-index-integrations/agent/llama-index-agent-coa/LICENSE

...ex-integrations/agent/llama-index-agent-dashscope/LICENSE

...ntegrations/agent/llama-index-agent-introspective/LICENSE

...a-index-integrations/agent/llama-index-agent-lats/LICENSE

...integrations/agent/llama-index-agent-llm-compiler/LICENSE

...ntegrations/agent/llama-index-agent-openai-legacy/LICENSE

...index-integrations/agent/llama-index-agent-openai/LICENSE

...grations/callbacks/llama-index-callbacks-agentops/LICENSE

...-integrations/callbacks/llama-index-callbacks-aim/LICENSE

...egrations/callbacks/llama-index-callbacks-argilla/LICENSE

...ons/callbacks/llama-index-callbacks-arize-phoenix/LICENSE

...grations/callbacks/llama-index-callbacks-deepeval/LICENSE

...rations/callbacks/llama-index-callbacks-honeyhive/LICENSE

...grations/callbacks/llama-index-callbacks-langfuse/LICENSE

...rations/callbacks/llama-index-callbacks-literalai/LICENSE

...ons/callbacks/llama-index-callbacks-openinference/LICENSE

...integrations/callbacks/llama-index-callbacks-opik/LICENSE