Cherry-pick #20527 to 7.x: Add metrics collection from cost explorer into aws/billing metricset

[kaiyan-sheng]

Cherry-pick of PR #20527 to 7.x branch. Original message:

What does this PR do?

This PR is to add metrics collection from cost explorer into aws/billing metricset.

Why is it important?

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test this PR locally

1. Enable aws module with ./metricbeat modules enable aws
2. Edit aws config file modules.d/aws.yml to:

- module: aws
  period: 24h
  metricsets:
    - billing
  credential_profile_name: elastic-beats
  cost_explorer_config:
    group_by_dimension_keys:
      - "AZ"
      - "INSTANCE_TYPE"
      - "SERVICE"
    group_by_tag_keys:
      - "aws:createdBy"

3. Run metricbeat ./metricbeat -e
4. You should be able to see data in billing dashboard

Screenshots

Related issues

• Closes Add AWS Cost and Usage reports to Metricbeat #20103

[elasticmachine]

Pinging @elastic/integrations-platforms (Team:Platforms)

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #21080 opened]

• Start Time: 2020-09-14T18:52:46.116+0000

• Duration: 60 min 26 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3587
Skipped	798
Total	4385