v0.2.0

Added

• v2 protobuf definitions for improved foundational store API (sf.substreams.foundational_store.service.v2 and sf.substreams.foundational_store.model.v2)
• Comprehensive documentation comments to all proto files in the proto/ directory
• Unit tests for the IfNotExist feature across all store implementations (badger, badger_time_traversal, postgres, postgres_time_traversal)
• Deprecation notices for proto service v1 with prominent warnings and migration guidance

Fixed

• ForkAwareStore SetAll and Set methods now properly check both cache and underlying storage for key existence when IfNotExist=true
• Fixed interface compliance issues in sink tests by updating mock implementations to match the Store interface