Merge LLM + LLMPredictor, reorganize types (#9388)

CHANGELOG.md

benchmarks/agent/agent_utils.py

benchmarks/struct_indices/spider/evaluate.py

docs/api_reference/service_context.rst

docs/changes/deprecated_terms.md

docs/community/faq/llms.md

docs/community/integrations/deepeval.md

docs/examples/agent/openai_agent_query_plan.ipynb

docs/examples/callbacks/HoneyHiveLlamaIndexTracer.ipynb

docs/examples/callbacks/WandbCallbackHandler.ipynb

docs/examples/citation/pdf_page_reference.ipynb

...sable_indices/city_analysis/City_Analysis-Decompose.ipynb

...e_indices/city_analysis/City_Analysis-Unified-Query.ipynb

...ples/composable_indices/city_analysis/City_Analysis.ipynb

...ble_indices/city_analysis/PineconeDemo-CityAnalysis.ipynb

.../financial_data_analysis/DeepLakeDemo-FinancialData.ipynb

...examples/customization/llms/SimpleIndexDemo-ChatGPT.ipynb

..._management/discord_dumps/help_channel_dump_05_25_23.json

..._management/discord_dumps/help_channel_dump_06_02_23.json

docs/examples/docstore/DocstoreDemo.ipynb