Move OpenAI, Anthropic, Google GenAI, and LangChain sinks that are
structurally typed (identified by API name alone) into MaD YAML files.
Role-filtered sinks that require inspecting a sibling 'role' property
remain in QL code since MaD cannot express conditional logic.
Use two distinct sink kinds:
- user-prompt-injection: picked up by UserPromptInjection.ql
- system-prompt-injection: picked up by SystemPromptInjection.ql
New files:
- javascript/ql/lib/ext/openai.model.yml
- javascript/ql/lib/ext/anthropic.model.yml
- javascript/ql/lib/ext/google-genai.model.yml
- javascript/ql/lib/ext/langchain.model.yml
