Summary of Changes

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This pull request is a preparatory step towards fully deprecating the rsa library as a core dependency. It refactors the RSA verification and signing mechanisms to conditionally load the rsa module only when its specific key formats are utilized. This change aims to reduce the default dependency footprint for users who primarily use cryptography for RSA operations, while maintaining backward compatibility for those still using rsa-specific key types. The PR is currently a draft, awaiting the merge and release of a prerequisite change.

Highlights

• Dependency Removal: The rsa library has been removed as a direct, required installation dependency, making it optional for users who do not explicitly rely on its specific key types.
• Lazy Loading Implementation: The _python_rsa module, which provides rsa library functionality, is now lazily loaded within RSAVerifier and RSASigner classes. It will only be imported if rsa.key.PublicKey or rsa.key.PrivateKey types are encountered, reducing the initial import overhead.
• Error Handling Updates: Docstrings for RSAVerifier and RSASigner have been updated to explicitly mention that an ImportError may be raised if rsa.key.PublicKey or rsa.key.PrivateKey are used without the rsa library being installed.

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