feat: add tagger(ai) to metadata worker

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What does this PR do?

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This pull request enhances the metadata worker to use the @lenster/lens package and the Hugging Face API for generating publication metadata. It also updates the relevant files to include the new environment variable and dependency.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at a414a5f

• Add HUGGINGFACE_API_KEY environment variable to authenticate requests to the Hugging Face API for natural language processing tasks (link, link)
• Add dependency on @lenster/lens package to use types and utilities for publication metadata (link, link)
• Import PublicationMetadataV2Input type from @lenster/lens package and annotate payload variable in postMetadata handler (link, link)
• Call Hugging Face API with payload.content as input and store tags and entities in taggerResponseJson variable in postMetadata handler (link)
• Include taggerResponseJson in the response payload of postMetadata handler (link)

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