Extract connection string building into PostgresConnectionStringPolicy so all
services use consistent pooling, application_name, and timeout settings.
Adopt the new policy in 20+ module DataSource/ServiceCollectionExtensions classes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Implemented CanonJson class for deterministic JSON serialization and hashing.
- Added unit tests for CanonJson functionality, covering various scenarios including key sorting, handling of nested objects, arrays, and special characters.
- Created project files for the Canonical JSON library and its tests, including necessary package references.
- Added README.md for library usage and API reference.
- Introduced RabbitMqIntegrationFactAttribute for conditional RabbitMQ integration tests.
