[Metricbeat] Add Aerospike Dashboard

[sorantis]

Partially addresses #10594.

This Aerospike dashboard visualizes the following metrics:

  - name: aerospike.namespace.objects.total
    description: Number of records in this namespace for this node.

  - name: aerospike.namespace.client.read.success
    description: Number of successful client read transactions.
  - name: aerospike.namespace.client.write.success
    description: Number of successful client write transactions.
  - name: aerospike.namespace.client.delete.success
    description: Number of successful client delete transactions.

  - name: aerospike.namespace.client.read.error
    description: Number of client read transaction errors.
  - name: aerospike.namespace.client.write.error
    description: Number of client write transaction errors.
  - name: aerospike.namespace.client.delete.error
    description: Number of client delete transaction errors.

  - name: aerospike.namespace.client.read.timeout
    description: Number of client read transaction timeouts.
  - name: aerospike.namespace.client.write.timeout
    description: Number of client write transaction timeouts.
  - name: aerospike.namespace.client.delete.timeout
    description: Number of client delete transaction timeouts.

  - name: aerospike.namespace.device.total.bytes
    description: Total bytes of disk space allocated to this namespace on this node.
  - name: aerospike.namespace.device.used.bytes
    description: Total bytes of disk space used by this namespace on this node.

Dashboard snapshot:

[kaiyan-sheng]

@sorantis Probably need a rebase here again to make ci happy.

[kaiyan-sheng]

LGTM!