[MetricBeat] Add aws autoscaling group metricset.

[kwinstonix]

What does this PR do?

Add AWS autoscaling module in metricbeat.

Why is it important?

AWS resource groups API doesn't support AutoScaling Group resource, so cloudwatch metricset can't fetch the tags of AutoScaling Group. We should use DescribeAutoScalingGroups API instead.

https://docs.aws.amazon.com/ARG/latest/userguide/supported-resources.html

Checklist

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

Related issues

• close #31303

[elasticmachine]

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• Start Time: 2022-08-09T13:26:56.755+0000

• Duration: 5 min 8 sec

Steps errors

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Load a resource file from a shared library

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• Description: approval-list/elastic/beats.yml

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• Description: githubApiCall: The REST API call https://api.github.com/orgs/elastic/members/kwinstonix return the message : java.lang.Exception: httpRequest: Failure connecting to the service https://api.github.com/orgs/elastic/members/kwinstonix : httpRequest: Failure connecting to the service https://api.github.com/orgs/elastic/members/kwinstonix : Code: 404Error: {"message":"User does not exist or is not a member of the organization","documentation_url":"https://docs.github.com/rest/reference/orgs#check-organization-membership-for-a-user"}

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[mergify[bot]]

This pull request does not have a backport label. If this is a bug or security fix, could you label this PR @kwinstonix? 🙏. For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change) To fixup this pull request, you need to add the backport labels for the needed branches, such as:
• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[mergify[bot]]

This pull request is now in conflicts. Could you fix it? 🙏 To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b aws-autoscaling-metricset upstream/aws-autoscaling-metricset
git merge upstream/main
git push upstream aws-autoscaling-metricset

[mergify[bot]]

This pull request is now in conflicts. Could you fix it? 🙏 To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b aws-autoscaling-metricset upstream/aws-autoscaling-metricset
git merge upstream/main
git push upstream aws-autoscaling-metricset