Create llm and embeddings implementation, include tests

[FilipZmijewski]

Thank you for contributing to LangChain.js!

• PR title: "package: description"

Where "package" is whichever of langchain, community, core, experimental, etc. is being modified. Use "docs: ..." for purely docs changes, "templates: ..." for template changes, "infra: ..." for CI changes.
Example: "community: add foobar LLM"

• PR message:

Description: The aim of these changes is to create first Langchain.js by IBM implementation. Solutions applied consist of LLMs and embeddings.
fyi @LukaszCmielowski

• Add tests and docs:

Expected tests for both of implemented features were added as well as README.md file.

• Lint and test: Run yarn format, yarn lint, yarn test and yarn test:int from the root of the package(s) you've modified.

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Name	Status	Preview	Comments	Updated (UTC)
langchainjs-docs	✅ Ready (Inspect)	Visit Preview		Sep 27, 2024 1:16pm

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langchainjs-api-refs	⬜️ Ignored (Inspect)			Sep 27, 2024 1:16pm

[jacoblee93]

Hey @FilipZmijewski, thanks for the PR!

As discussed with some of your colleagues, it would be best to start with this in community - we don't currently have the resources for new integration packages in the monorepo.