Add support for the azure billing package

[narph]

What does this PR do?

Add support for the azure billing package

Issue #1047

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• If I'm introducing a new feature, I have modified the Kibana version constraint in my package's manifest.yml file to point to the latest Elastic stack release (e.g. ^7.15.0).

Screenshots

Ex records:

{
        "_index" : ".ds-metrics-azure.billing-default-2021.11.16-000001",
        "_type" : "_doc",
        "_id" : "K6cVKX0BGqHSTKPCHwjc",
        "_score" : 1.0,
        "_source" : {
          "agent" : {
            "hostname" : "docker-fleet-agent",
            "name" : "docker-fleet-agent",
            "id" : "3a39222a-2dc8-41c5-b719-b5c4ea0257a0",
            "ephemeral_id" : "68ca2a06-f478-468d-b657-52c3d1066a83",
            "type" : "metricbeat",
            "version" : "7.15.3"
          },
          "elastic_agent" : {
            "id" : "3a39222a-2dc8-41c5-b719-b5c4ea0257a0",
            "version" : "7.15.3",
            "snapshot" : true
          },
          "cloud" : {
            "instance" : {
              "name" : "alextest223",
              "id" : "/subscriptions/..../resourceGroups/alex-test-resources/providers/Microsoft.Storage/storageAccounts/alextest223"
            },
            "provider" : "azure",
            "region" : "CentralUS"
          },
          "@timestamp" : "2021-11-16T14:09:48.857Z",
          "ecs" : {
            "version" : "1.11.0"
          },
          "service" : {
            "type" : "azure"
          },
          "data_stream" : {
            "namespace" : "default",
            "type" : "metrics",
            "dataset" : "azure.billing"
          },
          "host" : {
            "hostname" : "docker-fleet-agent",
            "os" : {
              "kernel" : "4.19.128-microsoft-standard",
              "codename" : "Core",
              "name" : "CentOS Linux",
              "type" : "linux",
              "family" : "redhat",
              "version" : "7 (Core)",
              "platform" : "centos"
            },
            "containerized" : true,
            "ip" : [
              "172.31.0.7"
            ],
            "name" : "docker-fleet-agent",
            "id" : "0e45dc0f765dee79aa8992abcd05b189",
            "mac" : [
              "02:42:ac:1f:00:07"
            ],
            "architecture" : "x86_64"
          },
          "metricset" : {
            "period" : 86400000,
            "name" : "billing"
          },
          "event" : {
            "duration" : 9829417200,
            "agent_id_status" : "verified",
            "ingested" : "2021-11-16T14:09:49Z",
            "module" : "azure",
            "dataset" : "azure.billing"
          },
          "azure" : {
            "subscription_id" : "...",
            "resource" : {
              "name" : "alextest223",
              "type" : "Microsoft.Storage",
              "group" : "alex-test-resources"
            },
            "billing" : {
              "pretax_cost" : "0.000002327970961",
              "product" : "Bandwidth Inter-Region - Data Transfer Out - North America",
              "usage_start" : "2021-11-15T00:00:00.000Z",
              "usage_end" : "2021-11-15T23:59:59.000Z",
              "account_name" : "R&D",
              "department_name" : "....",
              "currency" : "USD",
              "billing_period_id" : "/subscriptions/.../providers/Microsoft.Billing/billingPeriods/20211101"
            }
          }
        }
      }

 {
        "_index" : ".ds-metrics-azure.billing-default-2021.11.16-000001",
        "_type" : "_doc",
        "_id" : "fKcVKX0BGqHSTKPCIAhD",
        "_score" : null,
        "_source" : {
          "agent" : {
            "hostname" : "docker-fleet-agent",
            "name" : "docker-fleet-agent",
            "id" : "3a39222a-2dc8-41c5-b719-b5c4ea0257a0",
            "ephemeral_id" : "68ca2a06-f478-468d-b657-52c3d1066a83",
            "type" : "metricbeat",
            "version" : "7.15.3"
          },
          "elastic_agent" : {
            "id" : "3a39222a-2dc8-41c5-b719-b5c4ea0257a0",
            "version" : "7.15.3",
            "snapshot" : true
          },
          "cloud.provider" : "azure",
          "@timestamp" : "2021-11-16T14:09:48.857Z",
          "ecs" : {
            "version" : "1.11.0"
          },
          "service" : {
            "type" : "azure"
          },
          "data_stream" : {
            "namespace" : "default",
            "type" : "metrics",
            "dataset" : "azure.billing"
          },
          "host" : {
            "hostname" : "docker-fleet-agent",
            "os" : {
              "kernel" : "4.19.128-microsoft-standard",
              "codename" : "Core",
              "name" : "CentOS Linux",
              "family" : "redhat",
              "type" : "linux",
              "version" : "7 (Core)",
              "platform" : "centos"
            },
            "containerized" : true,
            "ip" : [
              "172.31.0.7"
            ],
            "name" : "docker-fleet-agent",
            "id" : "0e45dc0f765dee79aa8992abcd05b189",
            "mac" : [
              "02:42:ac:1f:00:07"
            ],
            "architecture" : "x86_64"
          },
          "metricset" : {
            "period" : 86400000,
            "name" : "billing"
          },
          "event" : {
            "duration" : 9832326700,
            "agent_id_status" : "verified",
            "ingested" : "2021-11-16T14:09:50Z",
            "module" : "azure",
            "dataset" : "azure.billing"
          },
          "azure" : {
            "billing" : {
              "usage_date" : "2021-11-17T00:00:00.000Z",
              "currency" : "USD",
              "forecast_cost" : "35.611388"
            }
          }
        },
        "sort" : [
          1637071788857
        ]
      }

[elasticmachine]

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[elasticmachine]

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