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Refactors the SDK validators to use classes instead of a single file
with repeating methods.

- Create base abstract SchemaValidator with AJV integration
- Implement specialized validators:
  - MetadataValidator with nested schema support
  - ClaimDataValidator for hypercert claims
  - AllowlistValidator for merkle tree entries
  - MerkleProofValidator for proof verification

- Add comprehensive test suite for all validators
- Maintain backwards compatibility through legacy API wrapper
- Improve error handling with structured ValidationError type
- Introduce ValidatorFactory for consistent instantiation

Add property validator that also specifically checks for geoJSONs. The
pattern should be scalable to multiple specific types of properties.

Updated the metadata validator to validate properties in metadata when
applicable.

Add and update test suite

Updates thresholds to represent current coverage