Remove dependency on pkg:jose

[kevmoo]

Standardize on pkg:dart_jsonwebtoken

[gemini-code-assist]

Summary of Changes

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This pull request streamlines the handling of JSON Web Tokens by replacing the jose package with dart_jsonwebtoken. This change standardizes the approach to JWT verification and key management, leading to a more consistent and potentially more maintainable codebase for authentication-related functionalities.

Highlights

• Dependency Migration: The project has migrated from using the pkg:jose package for JSON Web Token (JWT) operations to pkg:dart_jsonwebtoken.
• JWT Verification Logic Update: The token verification process in AuthBlockingTokenVerifier has been refactored to utilize the new dart_jsonwebtoken API for decoding, key retrieval, and verification.
• Key Caching Mechanism Refinement: The static caching mechanism for Google's public keys has been updated from JsonWebKeyStore to a Map<String, JWTKey> to align with the new dart_jsonwebtoken types.

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[gemini-code-assist]

Code Review

This pull request successfully replaces the jose package with dart_jsonwebtoken for handling JWTs, which helps standardize dependencies. The changes in token_verifier.dart correctly adapt the logic for token decoding, public key fetching, and signature verification to the new library's API. The overall implementation is solid, but I've identified a minor improvement to enhance type safety during token verification, making it more robust against potentially malformed JWTs.

[kevmoo]

Can haz merge?