Make Quartz Extension configurable for clustered scheduler engine

[masini]

Description
Quartz supports clustered JobStores that use JDBC and locks to synchronize between nodes:

Configure Clustering with JDBC-JobStore

The current Quartz extension has the RAMJobStore hardwired so this cannot be used.

Implementation ideas
As discussed here:

https://groups.google.com/forum/#!searchin/quarkus-dev/quartz%7Csort:date/quarkus-dev/XarQoQ8BLp4/kARhAbM9BAAJ

the current extension can consider using also the JDBCJobStore, or another extension can be written for that.

Use case
Our Quarkus application now uses @scheduled to synch from external data. Having this running on multiple node can be an issue.

[rafaelszp]

I support this enhancement. Our company will move projects from old wildfly(legacy, swarm and thorntail) to quarkus soon, but the absence of this feature will cause some delays or we wont be able to migrate to this amazing framework.

[machi1990]

I can give this a go over the weekend.