Operator Compute resources for log agent and metric agent should be separated

[andreivaloshyn]

Now we can set up compute resources only for entire agent

apiVersion: monitoring.grafana.com/v1alpha1
kind: GrafanaAgent
metadata:
  name: grafana-agent
  labels:
    app: grafana-agent
spec:
  image: grafana/agent
  resources:
    requests:
      cpu: {{ GRAFANA_AGENT_RESOURCE_CPU_MIN }}
      memory: {{ GRAFANA_AGENT_RESOURCE_MEMORY_MIN }}
    limits:
      cpu: {{ GRAFANA_AGENT_RESOURCE_CPU_MAX }}
      memory: {{ GRAFANA_AGENT_RESOURCE_MEMORY_MAX }}
....

and it will be applied for Metric StatefulSet and Log DaemonSet which sometimes can be inconvenient

[captncraig]

A workaround for this would be to have multiple GrafanaAgent resources for each use case. One for metrics and one for logs. It sounds a little annoying, but it would functionally be the same thing.

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