Add support for S3 Object Created events distributed using Eventbridge

[blockmar]

What does this PR do?

Adds support for S3 events over AWS EventBridge. This is useful if S3 Object Created needs to be sent to multiple recipients as the original S3 events are limited to one recipient for the same pattern.

This PR is related to Support Ticket 2428820

Motivation

We need to send files to both our security platform (company requirement) and to DataDog, this allows us to send the same event to multiple recipients.

Testing Guidelines

Tests verifying the event transformation.

Additional Notes

This will break the current behavior of EventBridge S3 events.

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog
• This PR passes the integration tests (ask a Datadog member to run the tests)
• This PR passes the unit tests
• This PR passes the installation tests (ask a Datadog member to run the tests)

[domalessi]

A few style tweaks, but looks great overall!