Add integration for AWS S3 Storage Lens

[kaiyan-sheng]

What does this PR do?

This PR is to add integration for AWS S3 Storage Lens to collect metrics listed here: https://docs.aws.amazon.com/AmazonS3/latest/userguide/storage_lens_metrics_glossary.html

This integration will be experimental for now.

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. ^7.13.0).

Screenshots

[elasticmachine]

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• Start Time: 2021-11-09T17:45:43.725+0000

• Duration: 27 min 43 sec

• Commit: 2cce00d

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[kaiyan-sheng]

Thanks for the review @aspacca ! Before merging, one question here: @ravikesarwani Should we have an S3 storage lens as a separate tile on the integrations page or should it be under the AWS S3 tile?

[ravikesarwani]

Kaiyan & I touch based on this and decided to keep this integration as separate from the current AWS S3 tile.
The main reason is the differences in the use case (organization wide), user persona (different users in the AWS org may configure/look at this data) and need for explicit enablement of these metrics (user needs to enable and define the org/account/buckets and also select free/paid).
Also the namespace and thus the resulting data stream where the data is stored is separate as well.

[kaiyan-sheng]

Adding dashboard for s3 storage lens will be in a separate PR.