Integrate Native Prometheus client in Ziggurat

• Integrated prometheus client for metrics reporting
• Users can now choose from StatsD or Prometheus for reporting metrics
• Metrics will be exposed in :{8002 | port}/metrics endpoint

Remove opentracing code from Ziggurat

What's Changed

• [Feature/EV-38] Remove opentracing code by @indrajithi in #275

New Contributors

• @indrajithi made their first contribution in #275

Full Changelog: v4.9.3...4.9.4

4.9.2

• Updates the Kafka streams and Kafka client to 2.8.2

4.9.1

• Adds graceful shutdown to the http server

4.9.0

• Improvises the publishing logic during consumption via subscribers.
• Upgrades the state management for rabbitmq subscribers.

4.4.0

• Allows channel mapper to push to dead letter queue

4.3.1

• Fixes the stop order of components to facilitate graceful shutdown of business operations

4.3.0

• Update on the Upgrade Guide document
• Removed the flatland dependency
• Allow handler function to push to dead letter queue

4.2.0 - Introducing structured logging

• Adds support for structured logging in JSON format
• Adds support for structured loggign in Text format

3.14.0

• Upgrade kafka-streams library to 2.8.0
• Removal of state stores
• Version upgrade of numerous dependencies
• Refactoring of test configuration files