Google k8s POC

[jsirianni]

Proposed Change

This PR contains everything required for our Google Cloud Ops POC, leveraging the following:

• K8s cluster metrics
• K8s node metrics (node, pod, container)
• Mysql metrics
• Statsd metrics
• JMX metrics

Notable changes

• Added unused --log-level flag, this should be implemented. It is required by the OTEL K8s operator
• Updated Makefile tidy target to mimic the Open Telemetry Contrib repo's implementation
• Upgraded to OTEL v0.40.0, v0.39.0 required some changes:
• Removed pkg/collector/provider.go in favor of go.opentelemetry.io/collector/config/configmapprovider.NewDefault()
  • the interface changed, and I discovered this built in capability for reading a config file
• ArrayVal() was replaced with SliceVal()
• Added new components required for our Google POC

This branch was been in use for 1+ month while we built a POC involving Kubernetes and Google Cloud Monitoring.

Checklist

• Changes are tested
• Changes are documented