Release v2.3.0

feat: enhance agent build process with environment variable checks an…

…d API key resolution

feat: Implement telemetry processing with schema validation and dead-…

…letter queue support

- Added TelemetryQueueOptions for queue configuration including dead-letter settings.
- Integrated SchemaRegistry for validating telemetry messages against defined schemas.
- Enhanced TelemetryProcessor to handle schema validation and requeue logic.
- Introduced SchemaRegistryService to manage schema registration and validation.
- Created SchemaRegistrySeeder to seed initial schema definitions on startup.
- Added new models and migrations for database schema related to telemetry and schema registry.
- Updated appsettings.json to include new configuration options for telemetry and schema registry.