Port AskNews retriever from python LangChain library

[SkSirius]

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Feature request

I propose moving the AskNews package from the Python LangChain library to the TypeScript LangChain library. This will allow TypeScript developers to leverage the capabilities of AskNews, enabling natural language-based news retrieval and enhanced integration within the TypeScript LangChain ecosystem.

The Python version of the package can be found here.

Details about AskNews and its functionality are available here.

Motivation

Bringing the AskNews package to the TypeScript LangChain library will make it available to a broader community of developers who work in JavaScript/TypeScript environments, which are commonly used for building web applications.

Enhancing feature parity between the Python and TypeScript LangChain libraries ensures consistent developer experience across both ecosystems.

Proposal (If applicable)

No response