provide profile as part of S3ClientConfig

[TalIfargan]

Description

Everything is ready to support custom S3 user profiles. We only need to allow passing it through the S3ClientConfig to the MountpointS3Client.

Additional context

The rust implementation is already ready to accept a custom user provided profile - we only need to reveal it to the user as part of the S3ClientConfig configuration.

• I have updated the CHANGELOG or README if appropriate

Testing

I have tested this PR with a custom profile and everything worked as expected. This PR is really a 4 line change that could make a nice impact for specific use cases.

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By submitting this pull request, I confirm that my contribution is made under the terms of BSD 3-Clause License and I agree to the terms of the LICENSE.

[IsaevIlya]

Hey @TalIfargan,
Thank you for your valuable contribution! The changes look promising overall. I've added two minor comments for your review. We'll need some time to properly evaluate and test this functionality, after which we'll provide further feedback.

[TalIfargan]

I think that after you are able to test this properly we might also update the README to include this is as an option for authentication.

Good catch. Would you be able to update the documentation while we complete the testing?

Sure.

done :)