feat: support S3 addressing style across Barman commands

[davidchandra95]

Summary

Add an ObjectStore-level s3AddressingStyle setting for auto, virtual, or path. The common command builder applies it to every Barman Cloud command and overrides older command-specific addressing arguments.

Root cause

The existing additionalCommandArgs settings only reached base-backup and WAL commands. Catalog, retention, and recovery commands used the shared builder without an addressing option, so S3 services that reject path-style URLs failed after a backup completed.

Validation

• go test ./...
• Plugin-focused tests against this library change

Staging use

A separate draft plugin and BBGE deployment change will use this source until an upstream release is available.

[mnencia]

Closing in favor of #288, which was opened first and covers the same commands through AppendCloudProviderOptionsFromConfiguration.

Your tests are good. I ported them to #288 (precedence over additional args, restore, non-S3 rejection) and credited you with a Co-authored-by trailer. withoutOption isn't needed: the configured flag is appended last and Barman uses the last value. In the restore path, a --addressing-style=value argument is skipped when the option is already set. The space-separated form leaks the value (existing behavior of appendAdditionalCommandArgs, not new here).

For staging, you can pin the plugin to the #288 branch until a release is out.