[receiver/k8s cluster receiver]add support for K8s leader extension into k8s cluster receiver

[rakesh-garimella]

Description

• Add support for k8s leader elector to k8s cluster receiver so that multiple instances of k8s cluster receiver can be executed.
• The instance which has the lease fetches the metrics.

example config:

extensions:
  k8s_leader_elector:
    auth_type: kubeConfig
    lease_name: foo
    lease_namespace: default
receivers:
  k8s_cluster:
    k8s_leader_elector: k8s_leader_elector
    node_conditions_to_report: [Ready, MemoryPressure]
    allocatable_types_to_report: [cpu, memory]
exporters:
  debug:
    verbosity: detailed

service:
  extensions: [k8s_leader_elector]
  pipelines:
    metrics:
      receivers: [k8s_cluster]
      exporters: [debug]
  telemetry:
    logs:
      level: info

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Testing

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