Add types to vendors.py

[cdrini]

Small addendum to #11379 , adding type hints to vendors.py

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[cdrini]

This looks a bit odd, but I couldn't find any use of this function... CC @mekarpeles

[Copilot]

Pull Request Overview

This PR adds type hints to the vendors.py file by introducing TypedDict classes for Better World Books metadata structures and updating function signatures with proper return types.

Key changes:

• Defines BetterWorldBooksMetadata and BetterWorldBooksMetadataError TypedDict classes for structured typing
• Updates return type annotations for Better World Books-related functions to use the new TypedDict types
• Removes the cached version of get_betterworldbooks_metadata function

Comments suppressed due to low confidence (1)

openlibrary/core/vendors.py:1

• The removal of cached_get_betterworldbooks_metadata may break code that depends on this cached function. This appears to be an unintended deletion rather than a refactoring, as no replacement is provided and the PR description doesn't mention removing caching functionality.

from __future__ import annotations

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