Support the `s3` charm relation interface

[gruyaume]

Context

It currently is not possible to integrate s3 requirers with minio using the s3 charm relation interface. Adding support for this interface to the minio-k8s charm would make it much easier to integrate requirers (like vault-k8s) with minio directly, improving user experience.

Reference

• S3 Charm relation interface definition: https://github.com/canonical/charm-relation-interfaces/tree/main/interfaces/s3/v0
• S3 Charm library: https://github.com/canonical/data-platform-libs/blob/main/lib/charms/data_platform_libs/v0/s3.py
• Vault K8s Charm: https://charmhub.io/vault-k8s

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5496.

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