Add S3 compatible artifact service

[Axibord]

I'd like to contribute by adding a new feature allowing upload of documents to an S3 compatible bucket (S3CompatibleArtifactService).

At first, I thought of adding a AwsS3ArtifactService but I think generalizing it is better with the help of boto3.

For the implementation, I think it will be pretty similar to the GCS one. I need to dig deeper and test.

If there is anything I need to know, please help.

[Axibord]

A PR is already open, didn't see it sorry