Support S3-compatible providers (non-AWS)

[mstenta]

Is your feature request related to a problem? Please describe.

AWS is where S3 started, but other providers offer S3-compatible object storage as well. Examples:

• https://www.linode.com/products/object-storage/
• https://www.digitalocean.com/products/spaces/

It seems that this plugin would work with non-AWS providers, but this statement in the docs leads to uncertainty:

s3_endpoint

endpoint for S3 compatible services. For example, Riak CS based storage or something. This option is deprecated for AWS S3, use s3_region instead.

https://github.com/fluent/fluent-plugin-s3/blob/master/docs/output.md#s3_endpoint

Describe the solution you'd like

Clarify whether or not non-AWS providers are supported by this plugin, or if that support will be removed in the future.

If the s3_endpoint is not going to be removed, then it should not be described as "deprecated" in the documentation.

Describe alternatives you've considered

None.

Additional context

No response

[github-actions]

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[repeatedly]

We don't have a plan to remove s3_endpoint option.
This option is deprecated for AWS S3, use s3_region instead. is not same as "This option is deprecated"