Add example and description for the dynatrace command

[feichashao]

As a first-time user of the command osdctl cluster dynatrace, I would like to know the expected behavior of these commands in the help text.

This PR adds examples and long descriptions of the dynatrace commands.

[feichashao]

@mjlshen Thanks for reviewing!

Made some changes in the new commit, now the output looks like,

$ osdctl cluster dt logs -h       
Fetch logs from Dynatrace and display the logs like oc logs.

  This command also prints the Dynatrace URL and the corresponding DQL in the output.

Usage:
  osdctl cluster dynatrace logs <cluster-id> [flags]

Examples:

  # Get the logs of HCP cluster hcp-cluster-id-123.
  # Specify to get the logs of the pod alertmanager-main-0 in namespace openshift-monitoring
  osdctl cluster dynatrace logs hcp-cluster-id-123 --namespace openshift-monitoring --pod alertmanager-main-0

and

$ osdctl cluster dt gather-logs -h      
Gathers pods logs and evnets of a given HCP from Dynatrace.

  This command fetches the logs from the HCP namespace, the hypershift namespace and cert-manager related namespaces.
  Logs will be dumped to a directory with prefix hcp-must-gather.

Usage:
  osdctl cluster dynatrace gather-logs <cluster-id> [flags]

Aliases:
  gather-logs, gl

Examples:

  # Gather logs for a HCP cluster with cluster id hcp-cluster-id-123
  osdctl cluster dynatrace gather-logs hcp-cluster-id-123

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[mjlshen]

/label tide/merge-method-squash

[openshift-ci[bot]]

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This pull-request has been approved by: feichashao, mjlshen

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