S3 Implement Replication

[blkgrlcto]

Changes

• Introduction: Updated to mention S3 Replication support alongside existing S3 capabilities.
• S3 Replication section (new): Added a new section covering:
  • One-way and two-way replication
  • How replication works in LocalStack (scan-based mechanism, eventual consistency)
  • IAM enforcement -how LocalStack evaluates replication permissions using the IAM engine directly, including role assumption and caching behavior
  • Metadata replication- default metadata replication and replica metadata synchronization
  • ReplicationStatus field and its possible values
  • Known limitations callout (IAM enforcement for tag-based filters, ACL replication)

Related Docs tickets

• DOC-259 - Initial S3 Replication implementation (one-way, two-way, ReplicationStatus)
• DOC-262 - Metadata replication (default replication and replica metadata synchronization)
• DOC-263 - IAM enforcement for replication tasks

[bentsku]

Thanks a lot for jumping on this! Sorry that at the time, we didn't have the new PR templates giving more context for the documentation updates, and in my PR descriptions there were a lot of internal-only informations.

I would remove a lot of the internal details (see comments) and then I think we'd be good to go 👍

How do we want to release such documentation changes? It's already part of dev but not stable yet

[quetzalliwrites]

hey @blkgrlcto looks like this still has feedback pending :)

[quetzalliwrites]

Hey @blkgrlcto we still have feedback pending 🌈

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[quetzalliwrites]

@bentsku it looks like Kiah has incorporated all your feedback, can you please review again and let us know if you approve? :)

[quetzalliwrites]

tyvm @blkgrlcto 🐈‍⬛

[blkgrlcto]

Addressed @bentsku's suggestions. Ready for final review