chore(python-sdk)!: rename prompt_provider to llm_provider

[czi-fsisenda]

Summary:

Just a rename. prompt_provider -> llm_provider

Test Plan:

• Wrote automated tests
  • Covered by existing tests
• Manually tested my changes, and here are the details:

[Copilot]

Pull request overview

This PR performs a breaking rename across the Python SDK from “prompt provider” terminology to “LLM provider”, updating the public config/schema APIs and all internal call sites accordingly.

Changes:

• Renamed LlmProvider → LLMProvider and updated all references (including metadata token usage typing).
• Renamed provider config types and EvaluatorConfig fields (e.g., GooglePromptProviderConfig/google_prompt_provider_config → GoogleLLMProviderConfig/google_llm_provider_config) and updated the LangChain provider factory to use the new fields.
• Updated generated evaluator settings, tests, and README examples to match the new API names.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sdks/python/src/learning_commons_evaluators/schemas/config.py	Renames provider enum/config classes and EvaluatorConfig/factory parameter names to the new LLM-provider terminology.
sdks/python/src/learning_commons_evaluators/schemas/metadata.py	Updates TokenUsage / EvaluationMetadata.total_token_usage to use LLMProvider.
sdks/python/src/learning_commons_evaluators/providers/langchain.py	Switches provider selection and config field access to LLMProvider and *_llm_provider_config.
sdks/python/src/learning_commons_evaluators/schemas/init.py	Re-exports LLMProvider instead of LlmProvider.
sdks/python/src/learning_commons_evaluators/config.py	Updates re-exports to new *LLMProviderConfig and LLMProviderConfig.
sdks/python/src/learning_commons_evaluators/init.py	Updates top-level exports to new provider config names and LLMProvider.
sdks/python/src/learning_commons_evaluators/providers/init.py	Updates module docstring terminology to LLM provider naming.
sdks/python/src/learning_commons_evaluators/evaluators/init.py	Updates docstring references to new config type names.
sdks/python/src/learning_commons_evaluators/settings/_generated_conventionality_settings.py	Updates generated settings to reference LLMProvider.
sdks/python/src/learning_commons_evaluators/settings/_generated_vocabulary_settings.py	Updates generated settings to reference LLMProvider.
sdks/python/tests/settings/test_load_settings.py	Updates tests to assert LLMProvider values.
sdks/python/tests/schemas/test_metadata.py	Updates tests to use LLMProvider in metadata-related schemas.
sdks/python/tests/schemas/test_config.py	Updates tests for renamed provider enum/config classes and factory parameter names.
sdks/python/tests/providers/test_langchain.py	Updates LangChain provider factory tests to use new config fields and LLMProvider.
sdks/python/tests/evaluators/test_conventionality.py	Updates evaluator test to use LLMProvider.
sdks/python/tests/evaluators/test_base.py	Updates evaluator base tests to use LLMProvider and updated dict keys.
sdks/python/README.md	Updates documentation/examples to the new *LLMProviderConfig and *_llm_provider_config APIs.

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