Add health check extension for liveness & readiness probes

[HussainRaza28]

Description of the issue

Kubernetes deployments of the CloudWatch Agent currently lack proper health monitoring capabilities. Without health check endpoints, Kubernetes cannot accurately determine if the agent is functioning correctly, leading to potential silent failures and reduced visibility in EKS console. This PR adds a health check extension to enable Kubernetes liveness and readiness probes, improving operational transparency.

Description of changes

• Added healthcheck.go translator to support the OpenTelemetry health check extension
• Configured default health check endpoint at 0.0.0.0:13133 with root path
• Registered the health check extension in the OpenTelemetry pipeline
• Ensured compatibility with Kubernetes probe configurations

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Tests

• Verified the health check extension works correctly in an EKS cluster
• Deployed CloudWatch Agent with the extension and confirmed Kubernetes could access the health endpoints
• Validated that liveness and readiness probes were properly configured and functioning