Add event.created field for cloudtrail data stream

[kaiyan-sheng]

What does this PR do?

This PR is to add event.created field for cloudtrail data stream in the AWS package.

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).

Related issues

• Closes AWS Integrations Mapping Error #1584

[elasticmachine]

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Build stats

• Start Time: 2021-09-08T11:36:24.060+0000

• Duration: 18 min 8 sec

• Commit: 927ee58

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Test	Results
Failed	0
Passed	256
Skipped	0
Total	256

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