Get started samples: add the stack Quarkus-hibernate + postgres + postgres extension

[sunix]

Is your enhancement related to a problem? Please describe.

It would be nice to have a Get Started devfile sample that would provide an example of Quarkus + hibernate, connecting to a preconfigured postgresql database and be able to browse the database, edit sql code with code completion and execute some command.

Describe the solution you'd like

basically would add this stack

• based on devfile: https://github.com/sunix/devfiles/blob/master/devfiles/quarkus-postgresql/devfile.yaml
• could be tried with: http://che.openshift.io/factory?url=https://github.com/sunix/devfiles/raw/master/devfiles/quarkus-postgresql/devfile.yaml

And we would need to also add and try the vscode extension https://marketplace.visualstudio.com/items?itemName=ckolkman.vscode-postgres

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[ibuziuk]

@sunix please take a look at https://github.com/che-incubator/quarkus-api-example that we are going to use in the upcoming blog post. Contributions are most welcome - https://github.com/che-incubator/quarkus-api-example