feat: Add local driver class instantiation support for did:proof

[PaperProofLabs]

This PR adds support for the did:proof method to the Universal Resolver by introducing a new local driver. The did:proof method is designed as part of the PaperProof ecosystem and resolves DIDs by retrieving DID Documents with embedded proof metadata.

Driver Details:

• DID Method: did:proof
• Driver Repository: PaperProofLabs/uni-resolver-driver-did-proof
• Specification Repository: PaperProofLabs/proof

Key Features:

• Local Driver Class Instantiation: This PR introduces support for registering drivers via local Java class instantiation (not just HTTP endpoints), enabling more efficient driver loading.
• DID Pattern Validation: The driver validates did:proof identifiers using the pattern ^(did:proof:z[A-Za-z0-9]{20,})$
• Query Parameter Parsing: Supports optional query parameters for customizing resolution behavior
• Full Driver Interface Implementation: Implements all required Driver interface methods including resolve(), dereference(), properties(), testIdentifiers(), and traits()

Resolution Flow:

1. The Universal Resolver routes did:proof identifiers to this driver
2. The driver validates the DID format and extracts the method-specific ID
3. The driver constructs a DID Document with proof-related metadata
4. The DID Document is returned in compliance with DID Core resolution format

Framework Changes:

• Extended LocalUniResolverConfigurator to support driverClass field for local instantiation
• Updated Spring Boot configuration in WebAppConfig to handle local drivers
• Added driverClass property binding in DriverConfigs
• Maintained backward compatibility with existing HTTP-based drivers