[s3] Allow S3-compatible endpoints, expose more options

[nanderson94]

Closes #2758

This change exposes many more configuration options of boto3 to the user. This has the primary intent of allowing S3-Compatible services to be used, but I also carried-through FIP and Dualstack endpoint selection.

Checklists

Pre-Review Checklist

• this PR does NOT contain credentials of any kind, such as API keys or username/passwords (double check config.yml.example)
• this PR has a meaningful title
• this PR links to all relevant github issues that it fixes or partially addresses
• if there is no GH issue, please create it. Each PR should have a link to an issue
• this PR has a thorough description
• Covered the changes with automated tests
• Tested the changes locally
• Added a label for each target release version (example: v7.13.2, v7.14.0, v8.0.0)
• Considered corresponding documentation changes
• Contributed any configuration settings changes to the configuration reference
• if you added or changed Rich Configurable Fields for a Native Connector, you made a corresponding PR in Kibana

Release Note

The S3 Connector now exposes options to support S3-Compatible object storage providers.

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[navarone-feekery]

Thanks for the contribution!
Could you add some unit tests to cover the new configurations to the test file?
I think some good tests would be:

1. ensuring self.s3_endpoint_url is assigned the right value in all circumstances
2. ensuring self.config initializes for all the options for new configs s3_addressing_style, aws_use_fips_endpoint, and aws_use_dualstack_endpoint.

[navarone-feekery]

Can you go through the order values for the configurations after this and update them?

[Marty1703]

This would be a great addition for us. We are running on-premise and can't use AWS, but do have Ceph OBS. Could someone have a look at the PR and include the missing items from the checklist?