Add tests for snippets

[billytrend-cohere]

This PR adds testing coverage to snippets:

• We currently ignore the results of the CI because they don't yet all pass
• The snippet changes required have been upstreamed here: https://github.com/cohere-ai/blobheart/pull/19545 (this will reduce noise from this pr)

This PR introduces a new package called py-snips and its dependencies, including cohere, cohere-ai, and gray-matter. It also adds a new workflow file called snippet-ci.yml and updates the package.json file.

Changes

• New Package: A new package called py-snips is introduced, with dependencies on cohere, cohere-ai, and gray-matter.
• Workflow File: A new workflow file called snippet-ci.yml is added, which defines a workflow for running tests and publishing documentation.
• Package.json: The package.json file is updated to include the new package and its dependencies.
• Babel Config: A new file called babel.config.js is added, which contains configuration for Babel, a JavaScript compiler.
• Jest Config: A new file called jest.config.ts is added, which contains configuration for Jest, a JavaScript testing framework.
• Package.json: A new file called package.json is added, which contains metadata and configuration for the package.
• Config: A new file called config.ts is added, which contains configuration for the package.
• Test Snapshots: A new file called snippets.test.ts.snap is added, which contains test snapshots for the package.
• Utils: A new file called utils.ts is added, which contains utility functions for the package.
• Pnpm-workspace.yaml: A new file called pnpm-workspace.yaml is added, which contains configuration for the package.
• Poetry.lock: A new file called poetry.lock is added, which contains lock file information for the package.
• Pyproject.toml: A new file called pyproject.toml is added, which contains configuration for the package.

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