[2pt]Export S3 config factory

[VannTen]

Problem statement

As a Thoth developer, I would like to use directly the boto3 library for cases
where storages (this module) API is inconvenient. However, I don't want to
parse the environment configuration myself

Proposal description

Exposes a function returning a config object created
from the environment variables described in the README

Additional context

This would have been useful for example in thoth-station/document-sync-job#37

Acceptance Criteria

• storages export a "s3 config factory"
• at least one client for that API (Calculate set difference to avoid unnecessary copy to S3 document-sync-job#37 is a good candidate)

/kind feature
/priority backlog
/good-first-issue
/sig stack-guidance

[sesheta]

@VannTen:
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Details

In response to this:

Problem statement

As a Thoth developer, I would like to use directly the boto3 library for cases
where storages (this module) API is inconvenient. However, I don't want to
parse the environment configuration myself

Proposal description

Exposes a function returning a botocore.config.Config object created
from the environment variables described in the README

Additional context

This would have been useful for example in thoth-station/document-sync-job#37

Acceptance Criteria

• storages export a "s3 config factory"
• at least one client for that API (Calculate set difference to avoid unnecessary copy to S3 document-sync-job#37 is a good candidate)

/kind feature
/priority backlog
/good-first-issue
/sig stack-guidance

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