[aws] Add max_number_of_messages to AWS integration config

[andrewkroh]

What does this PR do?

Give users the ability to set max_number_of_messages for the aws-s3 input.

https://www.elastic.co/guide/en/beats/filebeat/current/filebeat-input-aws-s3.html#_max_number_of_messages

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.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Closes [aws] Expose max_number_of_messages config in cloudtrail data stream #2298

Screenshots

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[elasticmachine]

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Build stats

• Start Time: 2021-12-06T18:24:30.220+0000

• Duration: 26 min 42 sec

• Commit: d58a41c

Test stats 🧪

Test	Results
Failed	0
Passed	303
Skipped	0
Total	303

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