feat: add event subcommands for bucket notifications

[overtrue]

Summary

• add rc event add/list/remove commands for bucket notification configuration
• add core notification models and ObjectStore APIs for get/set bucket notifications
• implement S3 adapter mapping for queue/topic/lambda notification rules
• add RustFS compatibility fallback: when PutBucketNotificationConfiguration returns SDK service error but config is applied, verify via read-back and treat as success
• document service-account policy file usage and new event commands in README

Issue

• closes Add event subcommand (rc event add/list/remove) for bucket notification configuration #54

Validation

• cargo fmt --all
• cargo clippy --workspace -- -D warnings
• cargo test --workspace
• Docker verification against rustfs/rustfs:latest:
  • rc event list local/issue54-notify (empty rules)
  • rc event add local/issue54-notify arn:aws:sns:us-east-1:123456789012:topic --event 's3:ObjectCreated:*'
  • rc --json event list local/issue54-notify (rule present)
  • rc event remove local/issue54-notify arn:aws:sns:us-east-1:123456789012:topic
  • rc event list local/issue54-notify (empty rules)

Notes

• For issue Feature Request setting of policies for service-accounts/Access Tokens #53, current main already supports policy assignment via rc admin service-account create --policy <json-file>. I posted a verification comment with a runnable example.

[Copilot]

Pull request overview

Adds first-class CLI support for managing per-bucket S3 event notification rules, backed by new core models/APIs and an S3 adapter implementation (including a RustFS compatibility read-back fallback).

Changes:

• Introduces rc event add/list/remove CLI subcommands for bucket notification configuration.
• Adds BucketNotification / NotificationTarget models and extends ObjectStore with get/set notification APIs.
• Implements S3 notification get/set mapping (queue/topic/lambda) plus RustFS “service error but applied” read-back verification fallback.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
crates/s3/src/client.rs	Implements notification get/set and RustFS read-back fallback; enables notifications capability.
crates/core/src/traits.rs	Adds notification data models and extends ObjectStore trait with notification APIs.
crates/core/src/lib.rs	Re-exports new notification types from rc_core.
crates/cli/src/commands/mod.rs	Wires the new event command into the CLI command enum/dispatcher.
crates/cli/src/commands/event.rs	Adds the event subcommand implementation plus unit tests for parsing/helpers.
README.md	Documents service-account policy file usage and the new event commands.

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