feat: support MariaDB Galera cluster

[PrzemekMalkowski]

Component/provider
Which area does this feature relate to? (check all that apply)

• [x ] MySQL (core sandbox functionality)
• [x ] ProxySQL (integration, deployment)
• Orchestrator (integration, deployment)
• PostgreSQL (future provider)
• [x ] Core (CLI, configuration, topology engine)

Is your feature request related to a problem? Please describe.
Currently, the only supported topology for MariaDB is async replication

Describe the solution you'd like
It would be great to have the ability to start Galera replication for MariaDB, similarly to PXC
Integration with ProxySQL is highly appreciated

Describe alternatives you've considered

Additional context

[renecannao]

Done in #100 .

Thank you for the report