Add Dynatrace GRAIL client for HCP log retrieval

[BATMAN-JD]

• OAuth 2.0 authentication with Dynatrace
• DQL query execution against GRAIL API
• Async query polling support
• GetPodContainerLogs() method for pod log retrieval
• Tested against hrm15629 staging environment

For ETCD analysis where oc logs is disabled in HCP namespaces.

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• Added tests
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• Validated the changes in a cluster
• Included documentation changes with PR

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